Parallel Axis Theorem , Theorem of Parallel Axis, Moment of Inertia, Second Moment of Area

Parallel Axis Theorem in Moment of Inertia

The moment of inertia of a body about an axis parallel to the body passing through its center is equal to the sum of the moment of inertia of the body about the axis passing through the center and the product of the mass of the body times the square of the distance of between the two axes.

Introduction to Moment of Inertia
For the introduction to Moment of Inertia go to the link below,

Introduction to Centroid / Centre of Gravity
For the introduction to Centroid/ Centre of Gravity go to the link below,