Identifying Angle Relationships

Front

What are adjacent angles?

Back

Angles that share a common vertex and a common side, but do not overlap.

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; they are equal.

Front

What is the complement of a 30° angle?

Back

60°.

Front

If two angles are supplementary and one angle measures 120°, what is the measure of the other angle?

Back

60°.

Front

If ∠AOB and ∠COB are adjacent angles, what can be said about their measures?

Back

They share a common vertex and side.

Front

What is the sum of the measures of complementary angles?

Back

90°.

Front

What is the sum of the measures of supplementary angles?

Back

180°.

Front

If two angles are vertical angles, what can be said about their measures?

Back

They are equal.