方ほう錐すい

noun

square drill

A drill bit with a square cross-section, used in woodworking and machining.

• 大だい工くは方ほう錐すいを使つかって角かく穴あなを開あけた。

  The carpenter used a square drill to make a square hole.

noun

regular pyramid

Abbreviation of 方錐形 (ほうすいけい). Used in geometry to refer to a pyramid with a square base.

See also: 方錐形 (ほうすいけい)

• 方ほう錐すいの体たい積せきを求もとめる公こう式しきを覚おぼえていますか。

  Do you remember the formula for the volume of a regular pyramid?