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 is 30 degrees, what is its complementary angle?

Back

The complementary angle is 60 degrees (90 - 30 = 60).

Front

If one angle is 110 degrees, what is its supplementary angle?

Back

The supplementary angle is 70 degrees (180 - 110 = 70).

Front

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

Back

Subtract the known angle from 90 degrees.

Front

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

Back

Subtract the known angle from 180 degrees.

Front

What is the relationship between complementary angles and right angles?

Back

Complementary angles together form a right angle (90 degrees).

Front

What is the relationship between supplementary angles and straight angles?

Back

Supplementary angles together form a straight angle (180 degrees).

Front

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

Back

Angle B is 45 degrees (90 - 45 = 45).

Front

If angle C is 75 degrees, what is angle D if they are supplementary?

Back

Angle D is 105 degrees (180 - 75 = 105).