円えん錐すい台だい

noun

truncated cone; frustum of a cone

Geometric term for a cone whose top has been cut off by a plane parallel to the base. Used in mathematics and engineering.

• 円えん錐すい台だいの体たい積せきを計けい算さんする公こう式しきを覚おぼえていますか。

  Do you remember the formula for calculating the volume of a truncated cone?

• この部ぶ品ひんは円えん錐すい台だいの形かたちをしている。

  This part is shaped like a frustum of a cone.