A standing person flexes the hip by 50° from the initial trochanter–knee–ankle line and then flexes the knee by 20°. Hip-to-knee length is 400 mm and knee-to-ankle length 300 mm. Find the ankle’s distance from the initial line in mm, nearest integer.
The thigh makes fifty degrees with the initial vertical line. Knee flexion reduces the shank’s angle to fifty minus twenty=thirty degrees in the source’s sagittal-plane geometry. Horizontal ankle displacement=400sin50°+300sin30°≈306.418+150=456.418 mm. Rounded answer is 456 mm.
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