Angle Operations Worksheet
Grade 9 Math worksheet focusing on angle operations, including complementary, supplementary, vertical, and angles on a straight line.
Includes
Standards
Topics
Angle Operations
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Date:
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Read each question carefully and answer to the best of your ability. Show all your work where applicable.
1. Two angles are complementary if their sum is:
90 degrees
180 degrees
360 degrees
45 degrees
2. If two angles are supplementary and one angle measures 70 degrees, what is the measure of the other angle?
20 degrees
110 degrees
70 degrees
180 degrees
3. Angles that are opposite each other when two lines intersect are called angles.
4. The sum of angles on a straight line is always degrees.
5. In the diagram below, identify a pair of complementary angles and state their measures. (Note: Diagram is illustrative, assume values for calculation.)
6. Two angles form a linear pair. If one angle measures 125 degrees, what is the measure of the other angle?
7. Vertical angles are always congruent.
True
False
8. The sum of angles around a point is 180 degrees.
True
False
9. Use the protractor shown to measure the angle indicated. (Assume the angle starts at 0 and ends at the 70-degree mark)
10. An angle measures (3x + 10) degrees. Its complementary angle measures (2x) degrees. Find the value of x and the measure of each angle.