Area moment of inertia or second moment of area Ix, Iy, polar moment of inertia Jz, section modulus Zx, Zy are
geometrical properties of sections used to determine the strength of parts that compose a machine, beams,
columns and other structural assemblies.
Ix is calculated about horizontal X-axis, and Iy about vertical Y-axis . The Z-axis is perpendicular on the plane X-Y through the centroid G.