Angle Relationships

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What are supplementary angles?

Back

Angles that add up to 180°.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of a transversal and inside the two lines.

Front

What are alternate exterior angles?

Back

Angles that are on opposite sides of a transversal and outside the two lines.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines in relation to a transversal.

Front

If two angles are complementary and one angle measures 30°, what is the measure of the other angle?

Back

60°.

Front

If two angles are supplementary and one angle measures 110°, what is the measure of the other angle?

Back

70°.

Front

What is the relationship between vertical angles?

Back

Vertical angles are always equal.

Front

If two lines intersect and form a pair of vertical angles, what can be said about their measures?

Back

They are equal.