*The moment of inertia of the surface is defined according to the axes that include the surface. It is denoted as Ix and Iy.
**The moment of inertia is divided by the distance between the axis passing through the center of gravity of the object and the farthest point to it, and the moment of strength is obtained. It is shown as Wx and Wy.
Momentum of Inertia is expressed as 4 to the cm, and moment of strength as cubic cm.