Parallel axis theorem state that "The Moment of Inestia (M I) about any axis in the plane of lamina is equal to the sum of the M.I of that lamina about the centoidal axis parallel to the given axis and the product of the area of lamina and square of the perpendicular distance between the two axis"
The '''parallel axis theorem''', also known as '''Huygens–Steiner theorem''', or just as '''Steiner's theorem''',<ref>{{cite book | title=Introduction to theoretical physics | author=Arthur Erich Haas | year=1928}}</ref> named after [[Christiaan Huygens]] and [[Jakob Steiner]], can be used to determine the [[moment of inertia]] or the [[second moment of area]] of a [[rigid body]] about any axis, given the body's moment of inertia about a [[Parallel (geometry)|parallel]] axis through the object's [[center of gravity]] and the [[perpendicular]] [[distance]] between the axes.
