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```Name ________________________________________ Date __________________ Class __________________
LESSON
4-1
Angles Formed by Intersecting Lines
Practice and Problem Solving: Modified
Use the terms and the diagrams below to answer Problems 1–4.
Notice that more than one term can be used for some questions.
The first one is done for you.
Terms:
linear pair
supplementary angles
complementary angles
right angle
vertical angles
1. ∠5 and ∠6 are ___________________________
2. ∠1 and ∠3 are __________________________________.
3. ∠1 and ∠2 are __________________________________ and __________________________________.
4. ∠FGK is a ______________________________________.
Use the diagrams above to answer these questions. The first one is
done for you.
90°
5. The measure of ∠FGK is ________.
6. If ∠5 is 70°, then the measure of ∠6 is ________.
7. If ∠2 is 140°, then the measure of ∠1 is ________ and the measure of
∠4 is _________.
In an equilateral triangle, all three sides have equal lengths and all three
angles have equal measures. Find the measure of the following angles.
The first one is done for you.
120°
8. supplement of ∠A _________
9. complement of ∠A _________
Draw your answer in the space provided. The first one is done for you.
10. Sketch ∠1 and ∠2 so that
they are vertical.
11. Sketch two lines so that they
form complementary angles.
Original content Copyright © by Houghton Mifflin Harcourt. Additions and changes to the original content are the responsibility of the instructor.
61
UNIT 2 Lines, Angles and Triangles
Practice and Problem Solving:
Modified
MODULE 4 Lines and Angles
LESSON 4-1
1. complementary angles
Practice and Problem Solving: A/B
2. vertical angles
1. 180°
JJJG
2. QR
3. supplementary angles; linear pair
3. 130°
5. 90°
4. 40°
6. 20°
5. 35
7. 40°; 140°
6. 100
8. 120°
7. 50°
9. 30°
4. right angle
8. 130°
9. m∠DEF = 29°; m∠FEG = 61°
10. m∠DEF = 91°; m∠FEG = 89°
11. Possible answers: ∠1 and ∠3 or ∠2
and ∠4
12. Possible answers: ∠1 and ∠2; ∠2 and
∠3; ∠3 and ∠4; or ∠1 and ∠4
13. right
14. 45°; 45°
Practice and Problem Solving: C
1. complementary
2. vertical
3. supplementary
4. The measures of the vertical angles are
equal.
5. a. ∠1 ≅ ∠2
6. complementary
b. m∠1 = m∠2
Success for English Learners
c. ∠2 and ∠4 are compl.
1. complementary
d. Given
2. 103.7°
e. m∠2 + m∠4 = 90°
f. Defn. Comp. ∠s
LESSON 4-2
g. m∠1 + m∠3 = m∠2 + m∠4
Practice and Problem Solving: A/B
1. 47°
2. 119°
3. 97°
Original content Copyright © by Houghton Mifflin Harcourt. Additions and changes to the original content are the responsibility of the instructor.
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