A therapist examines the range of motion of an athletes, Ask an Expert

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A therapist examines the range of motion of an athlete's knee joint. At full extension, the angle between the lower leg and thigh is 178°. At full flexion, the angle between the lower leg and thigh is 82°.

(a) What was the angular displacement of the lower leg from full extension to full flexion?

(b) Through what linear displacement did the ankle travel, if it is 40 cm from the knee joint?

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