Solve for Unknown Angles

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (vertex).

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

How do you find the complement of an angle?

Back

To find the complement of an angle, subtract its measure from 90 degrees.

Front

How do you find the supplement of an angle?

Back

To find the supplement of an angle, subtract its measure from 180 degrees.

Front

If ∠A = 30°, what is the complement of ∠A?

Back

The complement of ∠A is 60° (90° - 30°).

Front

If ∠B = 120°, what is the supplement of ∠B?

Back

The supplement of ∠B is 60° (180° - 120°).

Front

What is the measure of an angle if its complement is 40°?

Back

The measure of the angle is 50° (90° - 40°).

Front

What is the measure of an angle if its supplement is 70°?

Back

The measure of the angle is 110° (180° - 70°).

Front

What is an example of a pair of complementary angles?

Back

An example is 30° and 60°.