円錐台またはピラミッド 定義
A truncated cone or pyramid is a cone or pyramid which has its apex cut off by an intersecting plane. The plane may be either oblique or parallel to the base. If the truncating plane is parallel to the base then the figure is called a frustum.
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“Truncated Cone or Pyramid.” Mathwords, www.mathwords.com/t/truncated_cone_or_pyramid.htm.
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