perpendicular axis theorem

proper noun

A theorem that states the moment of inertia of a planar lamina (i.e. 2-D body) about an axis perpendicular to the plane of the lamina is equal to the sum of the moments of inertia of the lamina about the two axes at right angles to each other, in its own plane intersecting each other at the point where the perpendicular axis passes through it.

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Meanings

proper nounthe perpendicular axis theorem
  1. natural sciencesA theorem that states the moment of inertia of a planar lamina (i.e. 2-D body) about an axis perpendicular to the plane of the lamina is equal to the sum of the moments of inertia of the lamina about the two axes at right angles to each other, in its own plane intersecting each other at the point where the perpendicular axis passes through it.
Cite this entry
APA

perpendicular axis theorem. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/perpendicular%20axis%20theorem

MLA

“perpendicular axis theorem.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/perpendicular%20axis%20theorem. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “perpendicular axis theorem,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/perpendicular%20axis%20theorem.

Source: perpendicular axis theorem on Wiktionary, CC BY-SA 4.0.