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Area Moment of Inertia for some common Cross Sections
Rectangular Cross Section
Ix = b h3 / 12 (2)
where
b = width
h = height
Circular Cross Section
Ix = π r4 / 4
= π d4 / 64 (3)
where
r = radius
d = diameter
Cylindrical Cross Section
Ix = π (do4 - di
4) / 64 (4)
where
do = cylinder outside diameter
di = cylinder inside diameter
