Basic Angle Relationships

Front

What are vertical angles?

Back

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

Front

Are vertical angles supplementary?

Back

No, vertical angles are not supplementary; they are equal.

Front

If angle 2 measures 120 degrees, what is the measure of angle 3?

Back

Angle 3 also measures 120 degrees because vertical angles are equal.

Front

What is the sum of two supplementary angles?

Back

The sum of two supplementary angles is 180 degrees.

Front

What is the sum of two complementary angles?

Back

The sum of two complementary angles is 90 degrees.

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

What angle pair is formed when two lines intersect?

Back

Vertical angles are formed when two lines intersect.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles formed when a transversal crosses two parallel lines, located on opposite sides of the transversal.

Front

What are corresponding angles?

Back

Corresponding angles are pairs of angles that are in the same position on two parallel lines in relation to a transversal.