Final answer:
The goniometer is used to determine the exact measurement of angles around a joint.
Step-by-step explanation:
The goniometer is used to determine the exact measurement of angles around a joint. It is a tool commonly used in physical therapy and rehabilitation to assess and monitor the range of motion in joints. The goniometer typically consists of two arms, one of which remains stationary while the other moves to align with the bone segments being measured. By aligning the arms with the bones, the angle of the joint can be measured accurately.