Quiz 3 1 parallel lines transversals and special angle pairs - When parallel lines get crossed by another line (which is called a transversal ), you can see that many angles are the same, as in this example .lines cut unit 3 parallel and perpendicular lines homework 1 parallel lines and transversals gina wilson unit 3 parallel & perpendicular lines gina 2 gina wilson all things algebra 2014 unit 3 test ...

 
Play this game to review Mathematics. If two parallel lines are cut by a transversal, then each pair of corresponding angles is . Ankeny iowa driver

The activity can be used for notes, exit tickets, or quiz review. The students are given a set of parallel lines cut by a transversal and need to label each type of angle depending on the theorems. Increase engagement with this activity by adding color!You may also be interested in:Angle Theorem Proof ProjectParallel Lines Proof Cut and Paste.Name a pair of vertical angles. Angles 1 and 2. ... When a transversal crosses two parallel lines, eight angles (and four different kinds of angles) are formed. ... Angles Formed by a Transversal ... Play this game to review Mathematics. If two parallel lines are cut by a transversal, then each pair of corresponding angles is Expert-Verified Answer question 6 people found it helpful abidemiokin The following statements are true: Segment DEF is parallel to ABC The line segment AB is parallel to DE Line FC is parallel to AD the line that is skewed to DE is BC The given diagram is a triangular prism.Alternate exterior angles: Alternate exterior angles are the pair of angles that are formed on the outer side of two lines but on the opposite side of the transversal. ∠1 and ∠7. ∠2 and ∠8. If two parallel lines are cut by a transversal, then the resulting alternate exterior angles are congruent. ∠1 = ∠7. across the parallel lines, it is a transversal. Special relationships exist between parallel lines and transversals. MODULE 11 LESSON 11.1 Parallel Lines Cut by a Transversal 8.EE.7b, 8.G.5 LESSON 11.2 Angle Theorems for Triangles 8.EE.7, 8.EE.7b, 8.G.5 LESSON 11.3 Angle-Angle Similarity 8.EE.6, 8.EE.7, 8.G.5 345 May 1, 2019 · When transversals cross parallel lines, they form angles with special angle relationships. The angle pair relationships form two types of special angles. Congruent angles have the same measure. Supplementary angles have measures that add up to ???180{}^\circ???. Types of special angle pairs. Vertical angles share a vertex, but lie on opposite ... across the parallel lines, it is a transversal. Special relationships exist between parallel lines and transversals. MODULE 11 LESSON 11.1 Parallel Lines Cut by a Transversal 8.EE.7b, 8.G.5 LESSON 11.2 Angle Theorems for Triangles 8.EE.7, 8.EE.7b, 8.G.5 LESSON 11.3 Angle-Angle Similarity 8.EE.6, 8.EE.7, 8.G.5 345Complete the statements below by expressing your understanding on parallel lines cut by transversal. 1. If m<4 + m<5 = 180°, then the two angles are _____. 2. If a pair of parallel lines are cut by transversal then the vertical angles are _____. 3. When two parallel lines are cut by transversal then the alternate In geometry, a transversal is a line that intersects two or more other (often parallel ) lines. In the figure below, line n n is a transversal cutting lines l l and m m . When two or more lines are cut by a transversal, the angles which occupy the same relative position are called corresponding angles . ∠1 and ∠5 ∠2 and ∠6 ∠3 and ∠7 ... If two coplanar lines are cut by a transversal so that a pair of alternate exterior angles are congruent, then the two lines are parallel. If two parallel lines are cut by a transversal, then the alternate exterior angles are congruent. Angles between 2 lines and on the same side of a transversal.Find the measure of angle 1. ... Honors Quiz: Parallel lines with transversals. 78% average accuracy. 117 plays. 10th grade . Mathematics. 3 years ago by . Dana ... the parallel lines. These angles are supplementary. Same-Side Exterior - Angles on the same side of the transversal and outside the parallel lines. These angles are supplementary. Vertical - Angles that are across from each other and are formed by any intersecting lines (not just parallel lines and transversals). These angles are congruent.Unit D.3 Transversals: name angle pairs QUIZ. 20 terms Images. sophietheweird. 2.1 Parallel Lines and Angles. 13 terms Images. Abbyh229. Name That Angle Pair. 24 terms Images. jwillard315 Teacher.Angles inside a pair of lines on the opposite sides of a transversal and are congruent are called _____. The activity can be used for notes, exit tickets, or quiz review. The students are given a set of parallel lines cut by a transversal and need to label each type of angle depending on the theorems. Increase engagement with this activity by adding color!You may also be interested in:Angle Theorem Proof ProjectParallel Lines Proof Cut and Paste. Which angles have the same measure as angle 2? 3, 6, 7. Which angles have the same measure as angle 5? 1, 4, 8. Which angles are supplementary to angle 6? 1, 4, 5, 8. an angle that measures 180 degrees. Straight Angle. Angles that have a common side and a common vertex (corner point).If two lines which are parallel are intersected by a transversal then the pair of corresponding angles are equal. From Fig. 3: ∠1=∠6, ∠4=∠8, ∠2= ∠5 and ∠3= ∠7. The converse of this axiom is also true according to which if a pair of corresponding angles are equal then the given lines are parallel to each other.Play this game to review Mathematics. If two parallel lines are cut by a transversal, then each pair of corresponding angles is Another Type of angle pairs formed is Corresponding Angles When two lines are crossed by another line ( Transversal ), the angles in corresponding positions are called corresponding angles . Tags:Preview this quiz on Quizizz. Angle 3 and Angle 6 are examples of which type of angle pair? ... Parallel Lines and Transversals DRAFT.Preview this quiz on Quizizz. ... What type of angle pair is ∠1 and ∠3? ... Angle Relationships with Parallel Lines and a Transversal . 19.6k plays .When a transversal passes through a pair of parallel lines, special pairs of angles are formed. This video reviews corresponding angles, vertical angles, and... Play this game to review Pre-algebra. Opposite angles of two intersecting angles and are congruent are called _____. Angle Tasks 1: Parallel Lines and Transversals Framework Cluster Reasoning About Equations and Angles Standard(s) 8.G.5 Use informal arguments to analyze angle relationships Recognize the relationships between interior and exterior angles of a triangle Recognize the relationships between the angles created whenthe parallel lines. These angles are supplementary. Same-Side Exterior - Angles on the same side of the transversal and outside the parallel lines. These angles are supplementary. Vertical - Angles that are across from each other and are formed by any intersecting lines (not just parallel lines and transversals). These angles are congruent.Preview this quiz on Quizizz. What is the Angle Relationship. Parallel Lines and Transversals. ... Parallel Lines and Transversals DRAFT. 3 minutes ago. by agettler ...3.1 Lines and Angles 3.2 Properties of Parallel Lines 3.3 Proving Lines Parallel 3.4 Parallel Lines and Triangles 3.5 Equations of Lines in the Coordinate Plane 3.6 Slopes of Parallel and Perpendicular Lines Unit 3 Review Complete the statements below by expressing your understanding on parallel lines cut by transversal. 1. If m<4 + m<5 = 180°, then the two angles are _____. 2. If a pair of parallel lines are cut by transversal then the vertical angles are _____. 3. When two parallel lines are cut by transversal then the alternateThis is a great 6-question mini- quiz to assess student understanding of the relationships between parallel lines and transversals given a diagram. The bundle contains (1) practice quiz and (4) quiz versions. Subjects: Geometry, Math Test Prep. Grades: 9 th - 12 th. Types: Activities, Assessment. CCSS: Angle Pairs Created by Parallel Lines Cut by a Transversal Vocabulary Transversal - A line that crosses parallel lines to create pairs of congruent and supplementary angles Congruent - Having the same measurement Supplementary - Angles that add up to 180° Angle Pairs in Parallel Lines Cut by a Transversal . Interior . Interior . Exterior ...Complete the statements below by expressing your understanding on parallel lines cut by transversal. 1. If m<4 + m<5 = 180°, then the two angles are _____. 2. If a pair of parallel lines are cut by transversal then the vertical angles are _____. 3. When two parallel lines are cut by transversal then the alternate Engage live or asynchronously with quiz and poll questions that participants complete at their own pace. Lesson NEW Create an instructor-led experience where slides and multimedia are combined with quiz and poll questions. Name a pair of vertical angles. Angles 1 and 2. ... When a transversal crosses two parallel lines, eight angles (and four different kinds of angles) are formed. ... Angles Formed by a Transversal ...Play this game to review Geometry. What type of angle pair is ∠1 and ∠5? How many lines does a Transversal need to intersect? Preview this quiz on Quizizz. ... 3-1 Transversals and Angle Pairs ... Classifying triangles. Triangle angle sum. The Exterior Angle Theorem. Triangles and congruence. SSS and SAS congruence. ASA and AAS congruence. SSS, SAS, ASA, and AAS congruences combined. Right triangle congruence. Isosceles and equilateral triangles.Test Match Q-Chat Created by emoehs Terms in this set (18) Parallel Lines Coplaner lines that never intersect. (Notation ll) Perpendicular lines Lines that intersect at right angles (notation upside down T) Skew lines Non-coplanar lines that never intersect. Parallel planes Planes that never intersect (Notation ll) TransversalComplete the statements below by expressing your understanding on parallel lines cut by transversal. 1. If m<4 + m<5 = 180°, then the two angles are _____. 2. If a pair of parallel lines are cut by transversal then the vertical angles are _____. 3. When two parallel lines are cut by transversal then the alternate Detailed Solution for Test: Parallel Lines And Transversals - Question 4. First Mr parallel EF and RO is transversal line angle MRO=angle ROF= (alt.int .angle)toh angle MRO=55 degree and angle ROF =angle 1 toh 55=angle 1 is angle 1 =55 then second EF parallel PQ and OS is transversal line toh angle 2 = angle OSP is = (apt.int angle)toh angle 2 ...across the parallel lines, it is a transversal. Special relationships exist between parallel lines and transversals. MODULE 11 LESSON 11.1 Parallel Lines Cut by a Transversal 8.EE.7b, 8.G.5 LESSON 11.2 Angle Theorems for Triangles 8.EE.7, 8.EE.7b, 8.G.5 LESSON 11.3 Angle-Angle Similarity 8.EE.6, 8.EE.7, 8.G.5 3452 minutes 1 pt Angles on the same side of a transversal, in corresponding positions, and are congruent are called _____. Vertical angles Corresponding Angles Supplementary Angles Alternate Interior Angles 2. Multiple-choice 2 minutes 1 pt These angles are congruent. All of these Corresponding Alternate Interior Vertical 3. Multiple-choice 2 minutesFind the measure of angle 1. ... Honors Quiz: Parallel lines with transversals. 78% average accuracy. 117 plays. 10th grade . Mathematics. 3 years ago by . Dana ... lines are parallel. (Show 1 pair of alternate interior angles are congruent.) 3. If two lines are cut by a transversal and the same side interior angles are supplementary, then the lines are parallel. (Show 1 pair of same side interior angles totals 180) 4. If 2 lines are parallel to the same line, then they are parallel to each other. (Show ... 5 and 10 are alternate interior angles. _____ 7 and 11 are consecutive interior angles. _____ 10 and 14 are consecutive interior angles. _____ 1 and 3 are corresponding angles. _____ 4 and 15 are alternate exterior angles. _____ T a and e b and f d and h c and g Key Special Angle Pairs with Parallel Lines d and fThe measure of an exterior angle is equal to the sum of the two remote interior angles. slope. Rise (vertical change) over run (horizontal change. slope-intercept form. y=mx+b, where m is the slope and b is the y-intercept of the line. point slope form. y-y1=m (x-x1) Slopes of Parallel Lines. have to have same slope. Basic geometry and measurement 14 units · 126 skills. Unit 1 Intro to area and perimeter. Unit 2 Intro to mass and volume. Unit 3 Measuring angles. Unit 4 Plane figures. Unit 5 Units of measurement. Unit 6 Volume. Unit 7 Coordinate plane. Unit 8 Decomposing to find area.The measure of an exterior angle is equal to the sum of the two remote interior angles. slope. Rise (vertical change) over run (horizontal change. slope-intercept form. y=mx+b, where m is the slope and b is the y-intercept of the line. point slope form. y-y1=m (x-x1) Slopes of Parallel Lines. have to have same slope.3.1 Lines and Angles 3.2 Properties of Parallel Lines 3.3 Proving Lines Parallel 3.4 Parallel Lines and Triangles 3.5 Equations of Lines in the Coordinate Plane 3.6 Slopes of Parallel and Perpendicular Lines Unit 3 Review Dayastar Teacher Terms in this set (37) Parallel lines Coplanar linens that do not intersect Skew lines Lines that do not intersect and are not coplanar Parallel planes Planes that do not intersect Transversal A line that intersects two or more coplanar lines at two different points Interior angles Lie in then same region between linesParallel Lines and Transversals Date_____ Period____ Identify each pair of angles as corresponding, alternate interior, alternate exterior, or consecutive interior. 1) y x corresponding 2) y x alternate exterior 3) y x corresponding 4) y x consecutive interior 5) y x alternate interior 6) y x alternate exterior 7) y x alternate interior 8) y xDayastar Teacher Terms in this set (37) Parallel lines Coplanar linens that do not intersect Skew lines Lines that do not intersect and are not coplanar Parallel planes Planes that do not intersect Transversal A line that intersects two or more coplanar lines at two different points Interior angles Lie in then same region between lines Parallel Lines and Transversals quiz for 8th grade students. Find other quizzes for Mathematics and more on Quizizz for free! ... Angle 3 and Angle 6 are examples of ... Name a pair of vertical angles. Angles 1 and 2. ... When a transversal crosses two parallel lines, eight angles (and four different kinds of angles) are formed. ... Angles Formed by a Transversal ... Complete the statements below by expressing your understanding on parallel lines cut by transversal. 1. If m<4 + m<5 = 180°, then the two angles are _____. 2. If a pair of parallel lines are cut by transversal then the vertical angles are _____. 3. When two parallel lines are cut by transversal then the alternateStudy with Quizlet and memorize flashcards containing terms like True/False - A transversal must intersect two or more parallel lines., Use the following figure to answer the question. Angle 1 and Angle 4 are _________ angles. corresponding vertical supplementary adjacent, Use the following figure to answer the question. Angle 1 and Angle 3 are _________ angles. corresponding vertical ...First, students will need to be able to identify angle pairs, then know the properties and relationships. Children and parents can find these math worksheets online or even download the PDF format of these exciting worksheets. Parallel Lines and Transversals Worksheet - 1. Download PDF. Parallel Lines and Transversals Worksheet - 2.Play this game to review Pre-algebra. Angles on opposite sides of a vertex and are congruent are called _____.8th grade 7 units · 121 skills. Unit 1 Numbers and operations. Unit 2 Solving equations with one unknown. Unit 3 Linear equations and functions. Unit 4 Systems of equations. Unit 5 Geometry. Unit 6 Geometric transformations. Unit 7 Data and modeling. Course challenge. Engage live or asynchronously with quiz and poll questions that participants complete at their own pace. Lesson Create an instructor-led experience where slides and multimedia are combined with quiz and poll questions. How many lines does a Transversal need to intersect? Preview this quiz on Quizizz. ... 3-1 Transversals and Angle Pairs ... Detailed Solution for Test: Parallel Lines And Transversals - Question 4. First Mr parallel EF and RO is transversal line angle MRO=angle ROF= (alt.int .angle)toh angle MRO=55 degree and angle ROF =angle 1 toh 55=angle 1 is angle 1 =55 then second EF parallel PQ and OS is transversal line toh angle 2 = angle OSP is = (apt.int angle)toh angle 2 ... across the parallel lines, it is a transversal. Special relationships exist between parallel lines and transversals. MODULE 11 LESSON 11.1 Parallel Lines Cut by a Transversal 8.EE.7b, 8.G.5 LESSON 11.2 Angle Theorems for Triangles 8.EE.7, 8.EE.7b, 8.G.5 LESSON 11.3 Angle-Angle Similarity 8.EE.6, 8.EE.7, 8.G.5 345 If two parallel lines are cut by a transversal, then the corresponding angles have equal measure. THEOREM 3-11. If a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other one also. THEOREM 3-12. If two parallel lines are cut by a transversal, then the alternate interior angles are equal. A transversal that intersects two lines forms eight angles; certain pairs of these angles are given special names. They are as follows: Corresponding angles are the angles that appear to be in the same relative position in each group of four angles. In Figure , ∠l and ∠5 are corresponding angles. Other pairs of corresponding angles in ... Preview this quiz on Quizizz. Angle 3 and Angle 6 are examples of which type of angle pair? ... Parallel Lines and Transversals DRAFT. What type of angle pair are angles 3 and 5? Preview this quiz on Quizizz. ... Engage live or asynchronously with quiz and poll questions that participants complete at ...Another Type of angle pairs formed is Corresponding Angles When two lines are crossed by another line ( Transversal ), the angles in corresponding positions are called corresponding angles . Tags:Name a pair of vertical angles. Angles 1 and 2. ... When a transversal crosses two parallel lines, eight angles (and four different kinds of angles) are formed. ... Angles Formed by a Transversal ...3.1 Lines and Angles 3.2 Properties of Parallel Lines 3.3 Proving Lines Parallel 3.4 Parallel Lines and Triangles 3.5 Equations of Lines in the Coordinate Plane 3.6 Slopes of Parallel and Perpendicular Lines Unit 3 ReviewGiven two parallel lines cut by a transversal, their corresponding angles are supplementary. 2. Multiple-choice. True or False. Given two parallel lines are cut by a transversal, their same side exterior angles are congruent. 3. Multiple-choice. Find the measure of angle 1. 4.May 10, 2021 · When parallel lines get crossed by another line (which is called a transversal ), you can see that many angles are the same, as in this example .lines cut unit 3 parallel and perpendicular lines homework 1 parallel lines and transversals gina wilson unit 3 parallel & perpendicular lines gina 2 gina wilson all things algebra 2014 unit 3 test ... Preview this quiz on Quizizz. Angle 3 and Angle 6 are examples of which type of angle pair? ... Parallel Lines and Transversals DRAFT. Preview this quiz on Quizizz. Which lines are parallel? Think of your angle pairs and check for congruent or supplementary angles. Play this game to review Pre-algebra. Opposite angles of two intersecting angles and are congruent are called _____.Test Match Q-Chat Created by asherlylin Terms in this set (11) Select all that apply. Which of the following statements are true of a transversal? It is a line. It is parallel to other coplanar lines. It intersects two or more coplanar lines. It bisects line segments. It can never be perpendicular to other lines. It is a line. May 10, 2021 · When parallel lines get crossed by another line (which is called a transversal ), you can see that many angles are the same, as in this example .lines cut unit 3 parallel and perpendicular lines homework 1 parallel lines and transversals gina wilson unit 3 parallel & perpendicular lines gina 2 gina wilson all things algebra 2014 unit 3 test ... Preview this quiz on Quizizz. What is the Angle Relationship. Parallel Lines and Transversals. ... Parallel Lines and Transversals DRAFT. 3 minutes ago. by agettler ...If two parallel lines are cut by a transversal, then the corresponding angles have equal measure. THEOREM 3-11. If a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other one also. THEOREM 3-12. If two parallel lines are cut by a transversal, then the alternate interior angles are equal. Play this game to review Geometry. Angle Q and angle B are ... When two lines are cut by a transversal, if the alternate interior angles are equal in measure, then the lines are parallel. Two lines parallel to the same plane are parallel to each other. Perpendicular lines intersect to form right angles. Two adjacent angles whose exterior sides are opposite rays are complementary. Name a pair of vertical angles. Angles 1 and 2. ... When a transversal crosses two parallel lines, eight angles (and four different kinds of angles) are formed. ... Angles Formed by a Transversal ... Dayastar Teacher Terms in this set (37) Parallel lines Coplanar linens that do not intersect Skew lines Lines that do not intersect and are not coplanar Parallel planes Planes that do not intersect Transversal A line that intersects two or more coplanar lines at two different points Interior angles Lie in then same region between linesChapter 3 . Parallel . and . Perpendicular Lines. Sections Covered: 3.1 Identify Pairs of Lines and Angles. 3.2 Use Parallel Lines and Transversals. 3.3 Prove Lines are Parallel. 3.4 Find and Use Slopes of Lines. 3.5 Write and Graph Equations of Lines. The student will use the relationships between angles formed by two lines cut by a transversal toEngage live or asynchronously with quiz and poll questions that participants complete at their own pace. Lesson NEW Create an instructor-led experience where slides and multimedia are combined with quiz and poll questions. The converse of same-side interior angles theorem says that the two same-side interior angles must be supplementary (add up to 180°) for the lines to be parallel. 115° and 75° add up to 190° so lines l and m cannot be parallel. 5. Identify: What are the transversals of A B ↔ and B D ↔. The transversals of A B ↔ are A C ↔ and B D ↔.

What type of angle pair are angles 3 and 5? Preview this quiz on Quizizz. ... Engage live or asynchronously with quiz and poll questions that participants complete at .... Dfo

quiz 3 1 parallel lines transversals and special angle pairs

PARALLEL POSTULATES AND SPECIAL ANGLES (Chapter 2.1) Special Angles Certain angle pairs are given special names based on their relative position to one another or based on the sum of their respective measures. Angle Pairs Created with a Transversal A transversal is any line that intersects two or more lines in the same plane but at different ... Parallel Lines and Transversals Date_____ Period____ Identify each pair of angles as corresponding, alternate interior, alternate exterior, or consecutive interior. 1) y x corresponding 2) y x alternate exterior 3) y x corresponding 4) y x consecutive interior 5) y x alternate interior 6) y x alternate exterior 7) y x alternate interior 8) y xParallel lines are coplanar lines that do not intersect. The symbol ∥ means “is parallel to.”. When a line intersects two or more lines, the angles formed at the intersection points create special angle pairs. A transversal is a line that intersects two or more coplanar lines at distinct points.Play this game to review Geometry. Angle Q and angle B are ... Google Classroom. Below are two parallel lines with a third line intersecting them. 81^\circ 81∘ x^\circ x∘. x = x = ^\circ ∘. Stuck? Review related articles/videos or use a hint. Report a problem. 7. 4.Parallel Lines and Transversals quiz for 8th grade students. Find other quizzes for Mathematics and more on Quizizz for free! ... Angle 3 and Angle 6 are examples of ... Play this game to review Pre-algebra. Angles on opposite sides of a vertex and are congruent are called _____.When two lines are cut by a transversal, if the alternate interior angles are equal in measure, then the lines are parallel. Two lines parallel to the same plane are parallel to each other. Perpendicular lines intersect to form right angles. Two adjacent angles whose exterior sides are opposite rays are complementary.MrsSullivank Terms in this set (14) Supplementary angles Angles that sum to 180 degrees Complementary angles Angles that sum to 90 degrees Parallel lines Lines that do not intersect or touch each other Interior angles The angles inside a shape or in-between two parallel lines cut by a transversal Exterior Anglesacross the parallel lines, it is a transversal. Special relationships exist between parallel lines and transversals. MODULE 11 LESSON 11.1 Parallel Lines Cut by a Transversal 8.EE.7b, 8.G.5 LESSON 11.2 Angle Theorems for Triangles 8.EE.7, 8.EE.7b, 8.G.5 LESSON 11.3 Angle-Angle Similarity 8.EE.6, 8.EE.7, 8.G.5 345Play this game to review Pre-algebra. Opposite angles of two intersecting angles and are congruent are called _____.Unit 2: Parallel lines and Transversals (day 11) Objective: SWBAT identify special angle pairs and their properties. (3. 1/3. 2) **hw/hw log/storybook: “Parallel Lines/Transversals”/colored pencils Put Cube in your Block Box in front (make sure you tabbed cube 1 with name, block) Bucket A: SOL/TEI questions (stapled, make sure in order and name is on it) Regular Geometry: workbook p. 59 ...This is a great 6-question mini- quiz to assess student understanding of the relationships between parallel lines and transversals given a diagram. The bundle contains (1) practice quiz and (4) quiz versions. Subjects: Geometry, Math Test Prep. Grades: 9 th - 12 th. Types: Activities, Assessment. CCSS:8th grade 7 units · 121 skills. Unit 1 Numbers and operations. Unit 2 Solving equations with one unknown. Unit 3 Linear equations and functions. Unit 4 Systems of equations. Unit 5 Geometry. Unit 6 Geometric transformations. Unit 7 Data and modeling. Course challenge. 1 pt. Angle 3 and Angle 6 are examples of which type of angle pair? Alternate exterior angles. Alternate interior angles. Vertical angles. Corresponding angles. 2.Preview this quiz on Quizizz. Angle 3 and Angle 6 are examples of which type of angle pair? ... Parallel Lines and Transversals DRAFT.POSTULATE 8 If two parallel lines are cut by a transversal, then the corresponding angles have equal measure. THEOREM 3-11 If a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other one also. THEOREM 3-12 If two parallel lines are cut by a transversal, then the alternate interior angles are equal..

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