# 3.1. Angle Pairs. What s Your Angle? Angle Pairs. ACTIVITY 3.1 Investigative. Activity Focus Measuring angles Angle pairs

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1 SUGGESTED LEARNING STRATEGIES: Think/Pair/Share, Use Manipulatives Two rays with a common endpoint form an angle. The common endpoint is called the vertex. You can use a protractor to draw and measure angles in degrees.. Angles can be classified by their measures. Name the three classifications and then draw an example of each. Acute angle: Right Angle: Obtuse Angle:. Measure each angle and classify it according to its measure. a. 47, acute b. 68, acute ACTIVITY ACADEMIC VOCABULARY angle READING MATH B To read this angle, say angle ABC, angle CBA, or angle B. A C 3. ACTIVITY 3. Investigative Activity Focus Measuring angles Angle pairs Materials Protractors Straightedges Graphing utilities (optional) Chunking the Activity # #0 #7 #3 4 # 4 #8 0 #5 7 #5 # #8 9 #6 # 3 Think, Pair, Share Students have studied angle classifications in previous courses. This question serves as a review. Use Manipulatives Students learned how to measure angles with a protractor in earlier grades. Remind them to line up the 0 line with one side of the angle being measured and to be sure that the scale is oriented correctly. Do not be too concerned if students vary one or two degrees from the measures given as answers. c. 47, obtuse d. 90, right e. 0, obtuse Unit 3 Two-Dimensional Geometry and Similarity _SB_MS_3-_SE.indd 5 /3/09 7:7:08 PM Unit 3 Two-Dimensional Geometry and Similarity 5

2 ACTIVITY 3. Continued 3 Group Presentation Have students share their answers to this question on white boards. 4 Guess and Check Students are matching angles to form a complementary pair or a supplementary pair. TEACHER TO Watch for students who TEACHER conclude that each right angle in Parts b and f is complementary to itself. Complementary angles must be a pair of angles. ACTIVITY 3. Complementary angles are two angles whose sum is 90. Supplementary angles are two angles whose sum is 80. SUGGESTED LEARNING STRATEGIES: Group Presentation, Guess and Check Angles can be paired in many ways. 3. Compare and contrast complementary and supplementary angles. Answers may vary. Sample answer: Complementary angles have a sum of 90, but supplementary angles have a sum of 80. Two angles are needed to form both kinds of angle pairs. Complementary angles will form a right angle if they are placed next to each, but supplementary angles form a straight angle when they are placed next to each other. 4. Name pairs of angles that form complementary or supplementary angles. Justify you choices. a. b. 37 c. d. 5 3 e. f. 59 g. h /3/09 7:7: P The angles in Parts a and g are complementary because = 90 ; the angles in Parts b and f are supplementary because = 80 ; the angles in Parts d and e are complementary because = 90 ; the angles in Parts a and h are supplementary because = SpringBoard Mathematics with Meaning TM Level 5-58_SB_MS_3-_SE.indd 5 5 SpringBoard Mathematics with Meaning Level

3 M5-58_SB_MS_3-_SE.indd 53 SUGGESTED LEARNING STRATEGIES: Think/Pair/Share, Group Presentation, Quickwrite, Work Backward, Create Representations 5. Why are angles and in this diagram complementary? Answers may vary. Sample answer: ABC is a right angle that measures 90. Since ABC is formed by and, then and must be complementary. 6. Why are angles and in this diagram supplementary? Answers may vary. Sample answer: A straight angle (80 ) is formed by and, so and must be supplementary. 7. Can two obtuse angles be supplementary? Explain your reasoning. Answers may vary. Sample answer: Obtuse angles have a measure that is greater than 90, so the sum of two obtuse angles would be greater than 80, so they could not be supplementary. 8. Give the complement and supplement, if possible, of an angle that measures 3. Complement: 90-3 = 58 ; Supplement: 80-3 = Give the complement and supplement, if possible, of an angle that measures 98. Complement: = (-8 ), so complement does not exist. Supplement: = Two angles are complementary. One measures (x) and the other measures 48. a. Write an equation to find the measure of the missing angle. x + 48 = 90 b. Solve the equation for x. x = c. What is the value of the other angle? Show your work. 4 ; () = 4 ACTIVITY 3. MATH TERMS In Items 5 and 6, angles and are examples of adjacent angles. Adjacent angles have a common side but no common interior. Unit 3 Two-Dimensional Geometry and Similarity 53 /3/09 7:7:9 PM ACTIVITY 3. Continued 5 Think/Pair/Share Make sure students understand that these two angles share a ray in such a way that they form a 90º angle, thus forming a complementary pair. 6 Group Presentation Students should see that angles and form a straight line measuring 80, thus forming a supplementary pair. 7 Quickwrite Have students draw two obtuse angles if they need help understanding that two obtuse angles cannot be supplementary. There should be several different counterexamples within the class so that students should clearly visualize this concept. 8 Work Backward 9 Think/Pair/Share Students will not be able to give a complement because the 98 angle is obtuse. Suggested Assignment CHECK YOUR UNDERSTANDING p. 58, # UNIT 3 PRACTICE p. 9, # 3 0 Create Representations This question takes students to a more abstract level. Be on the lookout for students who think that the measure of the second angle is. The value of x is. Students must substitute the value of x into the expression x to find the unknown angle. Unit 3 Two-Dimensional Geometry and Similarity 53

4 ACTIVITY 3. Continued a Create Representations This question is similar to Item 0. Make sure that students substitute the value of x into the expression 3x to find the measure of the unknown angle. Differentiating Instruction Challenge students who may be ready for a more complex problem after completing Item with this problem: ABC and JKL are complementary. m ABC = ( 3 4 x - 3 ) and m JKL = (3x - 7). Find the measure of each angle. Show your work. Answer: x = 3; m ABC =, m JKL = 79. b Use Manipulatives TEACHER TO Some students may have TEACHER an easier time recognizing vertical angles if they see them as two v s that have a common vertex. c Think/Pair/Share Ask students to share their conclusions on white boards for the entire class to see. d Quickwrite If necessary, remind students that the symbol for congruent is and that they should say that numbers are equal and figures are congruent. ACTIVITY 3. MATH TERMS Vertical angles share a vertex but have no common rays. It may be easier to measure the angles if you extend the rays. 54 SpringBoard Mathematics with Meaning TM Level SUGGESTED LEARNING STRATEGIES: Create Representations, Use Manipulatives, Think/Pair/Share, Quickwrite. Two angles are supplementary. One angle measures (3x) and the other measures 3. a. Write an equation to find the measure of the missing angle. 3x + 3 = 80 b. Solve the equation for x. x = 9 c. What is the measure of the other angle? Show your work. 57 ; 3(9) = 57 Vertical angles are formed when two lines intersect.. and 3 are vertical angles. Find the measure of each angle using your protractor. m = 30 ; m 3 = Name another pair of vertical angles and find the measure of each angle. and 4; m = 50, m 4 = What conjectures can you make about the measures of a pair of vertical angles? Vertical angles are congruent. When two parallel lines are cut by a transversal, eight angles are formed. Transversal TEACHER TO Have students study the TEACHER figure below Item 4. You may want them to identify vertical angles and angles that form supplementary pairs before going on to the next question. 5-58_SB_MS_3-_SE.indd 54 /3/09 7:7:34 P 54 SpringBoard Mathematics with Meaning Level

5 M5-58_SB_MS_3-_SE.indd 55 SUGGESTED LEARNING STRATEGIES: Quickwrite, Group Presentation, Think/Pair/Share Use the drawing of parallel lines cut by a transversal on page and 8 are corresponding angles. a. Why do you think that they are called corresponding angles? Answers may vary. Sample answer: Corresponding angles are on the same side of the parallel lines and the transversal. b. Measure angles 4 and 8. m 4 = 68 m 8 = 68 c. Name three more pairs of corresponding angles and give their measures. m m 5 68, m 3 m 7, m m 6 d. What conjectures can you make about pairs of corresponding angles formed when parallel lines are cut by a transversal? They are congruent and 6 are alternate interior angles. a. Why are they called alternate interior angles? Answers may vary. Sample answer: Alternate interior angles are inside the parallel lines but on opposite sides of the transversal. b. Measure angles 3 and 6. m 3 = m 6 = c. Name another pair of alternate interior angles and give their measures. m 4 = 68, m 5 = 68 d. What conjectures can you make about pairs of alternate interior angles formed when parallel lines are cut by a transversal? They are congruent. 7. and 7are alternate exterior angles. a. Why are they called alternate exterior angles? Answers may vary. Sample answer: Alternate exterior angles are outside the parallel lines but on opposite sides of the transversal. b. Measure angles and 7. m = m 7 = c. Name another pair of alternate exterior angles and give their measures. m = m 8 = 68 d. What can you conclude about pairs of alternate exterior angles formed when parallel lines are cut by a transversal? They are congruent. ACTIVITY 3. Unit 3 Two-Dimensional Geometry and Similarity 55 /3/09 7:7:39 PM ACTIVITY 3. Continued e Quickwrite (a, d), Use Manipulatives (b), Think/Pair/ Share (c) Students may extend the lines to make measuring the angles easier. Ask students to write the angle pairs using the congruency symbol. Suggested Assignment CHECK YOUR UNDERSTANDING p. 58, #3 5 UNIT 3 PRACTICE p. 9, #4 6 f Group Presentation Help students to see that the interior angles are inside the parallel lines. TEACHER TO For the students who TEACHER need a concrete visual representation of alternate interior angles, you may want to use the letter Z. Angles tucked inside the letter Z are alternate interior angles. You can show how to change the orientation of the letter Z so that it looks like the letter N, or a backward Z, or a backward N. g Think/Pair/Share Help students see that the exterior angles are outside the parallel lines. Differentiating Instruction Visual learners may have better success at naming angle pairs if they can represent the parallel lines and transversal using pipe cleaners and counters. Ask the student to place pipe cleaners so that they are parallel to each other, and then place another pipe cleaner so that it intersects both parallel lines. As you call out an angle pair, such as alternate interior angles, students will identify alternate interior angles using their markers. Unit 3 Two-Dimensional Geometry and Similarity 55

6 ACTIVITY 3. Continued h Look for a Pattern This question serves as a review of alternate interior angles. i Think/Pair/Share This question serves as a review of alternate exterior angles. j Look for a Pattern This question gives students another opportunity to work with corresponding angles. ACTIVITY 3. SUGGESTED LEARNING STRATEGIES: Look for a Pattern, Think/Pair/Share 8. In Figure A, two parallel lines are cut by a transversal. The measure of = 4. Find m and describe the relationship that helped you determine the measure. Figure A Explanations may vary. Sample answer: m = 4 ; alternate interior angles are congruent when two parallel lines are cut by a transversal. 9. In Figure B, two parallel lines are cut by a transversal. The measure of = 38. Find m and describe the relationship that helped you determine the measure. Figure B Explanations may vary. Sample answer: m = 38 ; alternate exterior angles are congruent when two parallel lines are cut by a transversal. 0. In Figure C, two parallel lines are cut by a transversal. The measure of = 57. Find m and describe the relationship that helped you determine the measure. Figure C /3/09 7:7:4 P Explanations may vary. Sample answer: m = 57 ; corresponding angles are congruent when two parallel lines are cut by a transversal. 56 SpringBoard Mathematics with Meaning TM Level 5-58_SB_MS_3-_SE.indd SpringBoard Mathematics with Meaning Level

7 SUGGESTED LEARNING STRATEGIES: Group Presentation Use the work you did and the conjectures you made in Questions 4 7 to help answer Questions and.. In Figure D, lines j and k are parallel and are cut by a transversal. The measure of 4 = 7. Give the measures of the remaining seven angles. Justify your answers. Angle Measure Explanation 08 7 and 4 are supplementary angles. and 4 are congruent because they are vertical angles and 3 are vertical angles. Given and 5 are alternate interior angles. Alternate interior angles are congruent when lines are parallel. 7 4 and 6 are alternate interior angles. Alternate interior angles are congruent when lines are parallel. 7 and 7 are corresponding angles. Corresponding angles are congruent when lines are parallel. 08 and 8 are alternate exterior angles. Alternate exterior angles are congruent when lines are parallel. Figure D ACTIVITY j k ACTIVITY 3. Continued kl Group Presentation These questions serve as formative assessment of the activity. Encourage students to find as many different angle pairs as they can for Parts a d of Item. After each presentation list the angle pairs on the board under each classification until all pairs have been identified.. Find an angle pair that supports your conjecture about each type of angle pair. a. Vertical angles Answers may vary. Possible answers: angles and 3, and 4, 5 and 8, or 6 and 7 b. Corresponding angles Answers may vary. Possible answers: angles and 5, 4 and 7, and 6, or 3 and 8 c. Alternate interior angles Answers may vary. Possible answers: angles 3 and 5 or 4 and 6 d. Alternate exterior angles Answers may vary. Possible answers: angles and 8 or and 7 Unit 3 Two-Dimensional Geometry and Similarity 57 M5-58_SB_MS_3-_SE.indd 57 /3/09 7:7:47 PM Unit 3 Two-Dimensional Geometry and Similarity 57

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