The ratio of the moments of resistance of a solid circular shaft of diameter D and a hollow shaft (external diameter D and internal diameter d) is
AD⁴/(D⁴-d⁴)
BD³ /(D³ -d³ )
C(D⁴-d⁴)/D⁴
D(D³ -d³ )/D³
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AD⁴/(D⁴-d⁴)
BD³ /(D³ -d³ )
C(D⁴-d⁴)/D⁴
D(D³ -d³ )/D³