Front

A right angle is 90°.

Back

90°

Front

A straight angle is 180°.

Back

180°

Front

An acute angle is less than 90°.

Back

Less than 90°

Front

An obtuse angle is less than 90°.

Back

More than 90°, but less than 180°.

Front

Point A of the angle is the

Back

Vertex

Front

Two angles add up to 180°.

Back

Supplementary

Front

Two angles add up to 90°.

Back

Complementary

Front

Vertical angles are congruent.

Back

True

Front

Transversal intersects parallel lines.

Back

False

Front

Angles are supplementary or congruent if a transversal intersects parallel lines.

Back

True