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Geometrical Properties of Circle


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Diameter

d = m

Area

A = π·d2/4 m2

Centroid

zc = yc = d/2 m

Perimeter

P = π·d m

Second moments of area

Iz = Iy = π·d4/64 m4

Polar moment of area

Ix = 2·Iy m4

Radii of gyration

rz = ry = √Iy/A m

rx = √Ix/A m

Torsional constant

It = π·d4/32 m4

Torsional section modulus

Wt = 2·It/d m3


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