Angle Pair Relationships

Front

What are complementary angles?

Back

Two angles whose measures add up to 90 degrees.

Front

What are supplementary angles?

Back

Two angles whose measures add up to 180 degrees.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always equal.

Front

What are adjacent angles?

Back

Two angles that share a common side and a common vertex.

Front

If m∠A = 45°, what is the measure of its complementary angle?

Back

45° (complementary angle) = 90° - 45° = 45°.

Front

If m∠B = 120°, what is the measure of its supplementary angle?

Back

Supplementary angle = 180° - 120° = 60°.

Front

What is the relationship between linear pairs of angles?

Back

Linear pairs are two adjacent angles that form a straight line and are supplementary.

Front

If m∠1 + m∠2 = 90°, what can we say about angles 1 and 2?

Back

Angles 1 and 2 are complementary.

Front

If m∠3 = 135°, what is the measure of the angle that is vertical to it?

Back

The vertical angle to m∠3 is also 135°.

Front

What is the sum of the measures of angles in a triangle?

Back

The sum of the measures of angles in a triangle is always 180°.