Which theorem states that the moment of inertia of a plane lamina about an axis perpendicular to its plane is equal to the sum of the moments of inertia about two mutually perpendicular axes concurrent with the perpendicular axis and lying in the plane of the lamina?

💡 Solution & Explanation

The Perpendicular Axis Theorem establishes that for a planar lamina, the moment of inertia about an axis perpendicular to the plane equals the sum of moments of inertia about two mutually perpendicular axes lying within that same plane. The Parallel Axis Theorem relates moments of inertia about any parallel axes instead.