円えん環かん体たい

noun

solid torus

Technical term in geometry for a solid torus, a three-dimensional shape formed by revolving a disk around a coplanar axis.

• 円えん環かん体た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た。

  I memorized the formula for calculating the volume of a solid torus.