Angle Relationships Worksheet
Explore complementary, supplementary, vertical, and adjacent angles with this comprehensive Grade 9 math worksheet.
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Angle Relationships
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Read each question carefully and provide the best answer. Show all your work for short-answer questions.
1. Two angles are complementary if their sum is:
45 degrees
90 degrees
180 degrees
360 degrees
2. Which of the following pairs of angles are supplementary?
30° and 60°
90° and 90°
100° and 100°
10° and 80°
3. Angles that are opposite each other when two lines intersect are called angles.
4. Two angles that share a common vertex and a common side, but do not overlap, are called angles.
5. An angle measures 55°. What is the measure of its complementary angle?
6. An angle measures 110°. What is the measure of its supplementary angle?
Use the diagram below to answer questions 7 and 8.
7. Which angles are vertical angles?
8. Which angles are adjacent to angle 1?
9. All adjacent angles are also supplementary angles.
True
False
10. Vertical angles are always congruent.
True
False