Types of Angles

Front

Acute Angle

Back

An angle less than 90°

Front

Right Angle

Back

An angle equal to 90°

Front

Obtuse Angle

Back

An angle greater than 90°

Front

Straight Angle

Back

An angle equal to 180°.

Front

Reflex Angle

Back

An angle greater than 180° but less than 360°.

Front

Complementary Angles

Back

Two angles whose sum is 90°.

Front

Supplementary Angles

Back

Two angles whose sum is 180°.

Front

Adjacent Angles

Back

Two angles that share a common side and vertex.

Front

Vertical Angles

Back

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

Front

Linear Pair

Back

A pair of adjacent angles whose non-common sides form a straight line, summing up to 180°.