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Name _______________________________________ Date __________________ Class __________________
Practice A
Pairs of Angles
Complete the statements.
1. Adjacent angles are two angles in the same plane with a common __________
and a common __________, but no common interior points.
2. A __________ is a pair of adjacent angles whose noncommon sides
are opposite rays.
3. Complementary angles are two angles whose measures have a sum of __________.
4. The kind of angle formed by the noncommon sides of two adjacent and
complementary angles is a _______________.
5. _______________ angles are two angles whose measures
have a sum of 180.
6. The kind of angle formed by the noncommon sides of two adjacent and
supplementary angles is a _______________.
Draw your answer in the space provided.
7. Sketch 1 and 2 so that
they are adjacent angles.
8. Sketch 1 and 2 so that
they form a linear pair.
In an equilateral triangle, all three sides have equal lengths
and all three angles have equal measures. Find the measure
of the following angles.
9. supplement of A __________
10. complement of A __________
Draw your answer in the space provided.
11. Sketch 1 and 2 so that
they are vertical angles.
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
Holt McDougal Geometry
Name _______________________________________ Date __________________ Class __________________
6.
7. 7.5  x  22.5
8. back 2
1
1
somersault 2 twists
2
2
9. 68°
5. straight
6. obtuse
7. acute
9. obtuse
8. obtuse
10. straight
11. right
12. acute
13. Check students’ drawings.
14. Check students’ drawings.
15. Check students’ drawings.

10. No, WZ does not have to be the angle
bisector of XWY.
16. Check students’ drawings.
Reteach
Practice A
PAIRS OF ANGLES
1. Q, PQR, 1
1. vertex; side
2. linear pair
2. J, HJK, KJH
3. 90°
4. right angle
3. ABD, ABC, DBC
5. Supplementary
6. straight angle
4. obtuse
5. right
6. acute
7. 55°
8. 125°
9. 102°
10. 51°
7.
11. 129°
12. 51°
8.
Challenge
1.
9. 120°
10. 30.
11.
2. angle bisector
3. It is double the number of cuts.
4. 360  (2n) or 180  n
Practice B
5. 20; 18°
Problem Solving
1. Sample answer: LKG, GKH, HKJ,
JKL, LKH
1. 180°
2. QR
3. 137.9°
4. (110  8x)°
5. 132°
6. 135°
2. 103°
3. 100°
7. mDEF  29°; mFEG  61°
4. 65
5. 27
8. mDEF  91°; mFEG  89°
6. A
7. J
9. Possible answers: 1 and 3 or 2
and 4
Reading Strategies
1. obtuse
3. right
2. acute
4. right
10. Possible answers: 1 and 2; 2 and
3; 3 and 4; or 1 and 4
11. right
12. 45°; 45°
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
Holt McDougal Geometry