Angle Types and Pairs Vocabulary

Front

An angle less than 90°

Back

Acute Angle

Front

An angle equal to 90°

Back

Right Angle

Front

An angle greater than 90° but less than 180°

Back

Obtuse Angle

Front

An angle equal to 180°

Back

Straight Angle

Front

Two angles whose sum is 90°

Back

Complementary Angles

Front

Two angles whose sum is 180°

Back

Supplementary Angles

Front

Two angles that share a common side and vertex

Back

Adjacent Angles

Front

Angles opposite each other when two lines intersect

Back

Vertical Angles