Angle Relationships

Front

What are vertical angles?

Back

Vertical angles are angles that are opposite each other when two lines intersect. They are always equal in measure.

Front

What are adjacent angles?

Back

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

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 angle A is 40 degrees, what is the measure of its complement?

Back

50 degrees (90 - 40 = 50).

Front

If angle B is 120 degrees, what is the measure of its supplement?

Back

60 degrees (180 - 120 = 60).

Front

What is the measure of angle b if it is vertical to angle a which measures 39 degrees?

Back

39 degrees (vertical angles are equal).

Front

If two angles are supplementary and one measures 113 degrees, what is the measure of the other angle?

Back

67 degrees (180 - 113 = 67).

Front

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

Back

90 degrees.

Front

If angle C is 15 degrees, what is the measure of its supplement?

Back

165 degrees (180 - 15 = 165).