Applied Mechanics and Graphic Statics
M.I. of a thin ring (external diameter D, internal diameter d) about an axis perpendicular to the plane of the ring, is

π/32 (D⁴ × d⁴)
π/32 (D⁴ - d⁴)
π/64 (D⁴ + d⁴)
π/32 (D⁴ + d⁴)

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