Complementary and Supplementary Angles

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 one angle measures 30 degrees, what is the measure of its complementary angle?

Back

60 degrees.

Front

If one angle measures 120 degrees, what is the measure of its supplementary angle?

Back

60 degrees.

Front

What is the sum of the measures of two complementary angles?

Back

90 degrees.

Front

What is the sum of the measures of two supplementary angles?

Back

180 degrees.

Front

If angle A is 45 degrees, what is the measure of angle B if they are complementary?

Back

Angle B is 45 degrees.

Front

If angle C is 70 degrees, what is the measure of angle D if they are supplementary?

Back

Angle D is 110 degrees.

Front

How do you find the measure of a missing angle in a complementary pair?

Back

Subtract the known angle from 90 degrees.

Front

How do you find the measure of a missing angle in a supplementary pair?

Back

Subtract the known angle from 180 degrees.