Types of Angles

Front

Acute Angle

Back

Measures less than 90°.

Front

Right Angle

Back

Measures exactly 90°.

Front

Obtuse Angle

Back

Measures more than 90° but less than 180°.

Front

Straight Angle

Back

Measures exactly 180°.

Front

Reflex Angle

Back

Measures more than 180° but less than 360°.

Front

Full Rotation (Complete Angle)

Back

Measures exactly 360°.

Front

Complementary Angles

Back

Two angles whose measures add up to 90°.

Front

Supplementary Angles

Back

Two angles whose measures add up to 180°.

Front

Adjacent Angles

Back

Two angles that have a common side and a common vertex.

Front

Vertical Angles

Back

Angles opposite each other when two lines cross. They are always equal.