Second Moment of Area

I_{y} = \int_{A} z^{2} d A

I_{z} = \int_{A} y^{2} d A

I_y	Second moment of area about the y-axis
z	Vertical distance of the y-axis to the element dA
I_z	Second moment of area about the z-axis
y,	Vertical distance of the z-axis to the element dA

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