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Angular displacement theta in a circular motion is related to arc length s and radius r as:

Atheta = s + r
Btheta = r / s
Ctheta = s × r
Dtheta = s / r
Answer & Solution
Correct answer: D. theta = s / r
Angular displacement theta = s/r, measured in radians. For one full revolution, s = circumference = 2πr, giving theta = 2π.
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