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正四面体 (せいしめんたい) Japanese meaning | Kotomora

正せい四し面めん体たい

せ

い

し

め

ん

た

い

Meanings

1

regular tetrahedron

A polyhedron with four congruent equilateral triangular faces; a fundamental shape in geometry.

正せい四し面めん体た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 tetrahedron?

Kanji

正correct, justice, righteous
四four
面mask, face, features
体body, substance, object

Related words

四し面めん体たい
四面体 is a general tetrahedron, not necessarily regular. 正四面体 specifically has all edges equal and faces congruent.
正せい多た面めん体たい
正多面体 is the broader category of regular polyhedra; 正四面体 is one of the five Platonic solids.

Built from

正せい+四し面めん体たい

Etymology

Compound of 正 (regular) + 四面体 (tetrahedron). The term follows standard mathematical naming conventions.