*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.*