Last Updated：2025/12/06
(physics) 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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perpendicular axis theorem
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Source Word
perpendicular axis theorem
Noun
uncountable
(physics)
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.
Japanese Meaning
物理学における定理で、平面状の薄い板（2次元の物体）について、板の面に垂直な軸周りの慣性モーメントは、板内部に存在する互いに直交する2つの軸（交点は垂直軸が通過する点）の周りの慣性モーメントの和に等しいという定理です。
Sense（1）
(physics)
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.
