The legs and upper body of an astronaut floating in space form a natural angle of about 128.

People recovering from knee surgery track their progress by achieving flexibility to a certain angle measure.

To measure angles between joints, orthopedic surgeons and physical therapists, use an instrument called a goniometer.

Angle measure is related to the number system of the ancient Babylonians.

Angles can be measured in radians and grads as well as degrees.