Understanding Complementary Angles Quiz

Which of the following pairs of angles are complementary?

• 45° and 45°

• 30° and 60°

• 90° and 0°

• 75° and 15°

If one angle is 35°, what is the measure of its complementary angle?

• 55°

• 65°

• 145°

• 125°

Two angles are complementary. If one angle measures 80°, what is the measure of the other angle?

• 10°

• 100°

• 90°

• 20°

Which of the following statements is true about complementary angles?

• They always sum up to 180°.

• They are always adjacent to each other.

• They always sum up to 90°.

• They are always equal in measure.

If two angles are complementary and one angle is twice the measure of the other, what are the measures of the two angles?

• 30° and 60°

• 20° and 40°

• 60° and 30°

• 45° and 45°

If the measure of one angle is three times the measure of its complementary angle, what is the measure of the larger angle?

• 22.5°

• 67.5°

• 45°

• 30°

Two angles are complementary. The first angle is 10° more than twice the second angle. What is the measure of the smaller angle?

• 25°

• 20°

• 30°

• 26.67°

Which of the following is NOT a pair of complementary angles?

• 50° and 40°

• 75° and 15°

• 45° and 55°

• 90° and 90°

If an angle measures 40°, which of the following could be its complementary angle?

• 50°

• 140°

• 90°

• 45°