An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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perpendicular axis theorem
  فربین ِ آسه‌ها‌ی ِ پالار  
farbin-e âsehâ-ye pâlâr
Fr.: théorème des axes perpendiculaires  

The → moment of inertia of a plane object (→ lamina) about an axis perpendicular to the plane is equal to the sum of the moments of inertia about any two perpendicular axes in the plane. Thus if x and y axes are in the plane, Iz = Ix + Iy.

See also: → perpendicular; → axis; → theorem.