Parallel Axis Theorem
It is often easier to derive the second moment of area with respect to its centroidal axis, . However, it may be necessary to calculate the second moment of area with respect to a different, parallel axis, say the axis. The parallel axis theorem states
where
- = Area of the shape
- = Perpendicular distance between the and axes
A similar statement can be made about the axis and the parallel centroidal axis. Or, in general, any centroidal axis and a parallel axis.
Read more about this topic: Second Moment Of Area
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