Angle Relationships

Front

What is an adjacent angle?

Back

An adjacent angle is an angle that is next to another angle and shares a common side.

Front

What does it mean for two angles to be supplementary?

Back

Two angles are supplementary if the sum of their measures is 180 degrees.

Front

What does it mean for two angles to be complementary?

Back

Two angles are complementary if the sum of their measures is 90 degrees.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always congruent (equal in measure).

Front

If angle A is 120°, what is the measure of its supplementary angle?

Back

60°

Front

If angle 1 and angle 2 are adjacent, what can we say about their relationship?

Back

They share a common side and vertex.

Front

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

Back

90 degrees.

Front

What is the relationship between two angles that are vertical?

Back

Vertical angles are always congruent (equal in measure).

Front

If angle 5 is 40°, what is the measure of the angle adjacent and supplementary to it?

Back

140°.

Front

What is the definition of a linear pair of angles?

Back

A linear pair of angles are two adjacent angles that form a straight line, and their measures add up to 180 degrees.