Angle Relationships

Front

What are corresponding angles?

Back

Corresponding angles are pairs of angles that are in the same position on two parallel lines cut by a transversal. They are equal in measure.

Front

What is the measure of a straight angle?

Back

A straight angle measures 180°.

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

What is the sum of the angles in a triangle?

Back

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

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that lie between two parallel lines on opposite sides of a transversal. They are equal in measure.

Front

What is the measure of a right angle?

Back

A right angle measures 90°.

Front

If two angles are complementary, what is their sum?

Back

The sum of two complementary angles is 90°.

Front

If two angles are supplementary, what is their sum?

Back

The sum of two supplementary angles is 180°.

Front

How do you find the measure of an unknown angle when given the measure of one angle in a pair of complementary angles?

Back

Subtract the known angle's measure from 90°.

Front

How do you find the measure of an unknown angle when given the measure of one angle in a pair of supplementary angles?

Back

Subtract the known angle's measure from 180°.