Adjacent, Vertical, Complementary, Supplementary Angles

Front

What are adjacent angles?

Back

Adjacent angles are two angles that share a common side and a common vertex, but do not overlap.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

If ∠A is 30°, what is the measure of its complementary angle?

Back

60° (90° - 30° = 60°)

Front

If ∠B is 110°, what is the measure of its supplementary angle?

Back

70° (180° - 110° = 70°)

Front

If ∠COB is 124°, what is the measure of ∠BOD?

Back

56° (They are supplementary: 180° - 124° = 56°)

Front

Identify a pair of adjacent angles from the following: ∠AOD & ∠AOC, ∠COB & ∠AOD.

Back

∠AOD & ∠AOC (They share a common side and vertex.)

Front

What is the relationship between two angles that are both 45°?

Back

They are vertical angles and are equal.

Front

If two angles are supplementary and one angle measures 90°, what is the measure of the other angle?

Back

90° (180° - 90° = 90°)