tetrahedron

/ˌtɛtɹəˈhidɹən/ noun B2

a solid with four triangular faces

Word Origin A tetrahedron is literally a 'four-seater' — from Greek tetra- 'four' and hedra 'seat, face'. It's the simplest polyhedron, with four triangular faces. The same hedra root gives us cathedral (bishop's seat), polyhedron, and even sedentary. The tetra- prefix appears in tetrapod, tetrarchy, and tetralogy.

noun a solid with four triangular faces B2

A tetrahedron is a pyramid with a triangular base.

(名词) 四面体 【有四个三角形面的立体】

四面体是一个底面为三角形的棱锥。

(sustantivo) tetraedro [sólido con cuatro caras triangulares]

Un tetraedro es una pirámide con base triangular.

(nom) tétraèdre [Solide géométrique à quatre faces triangulaires.]

Un tétraèdre est une pyramide à base triangulaire.

(Substantiv) Tetraeder [ein geometrischer Körper mit vier dreieckigen Flächen]

Ein **tetrahedron** hat vier Ecken und sechs Kanten.

(名詞) 4つの三角形の面を持つ立体

tetrahedron は、三角形の底面を持つピラミッド型の形である。

(substantivo) tetraedro [um sólido com quatro faces triangulares]

Um tetraedro é uma pirâmide com base triangular.

noun A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids. countable

In geometry class, we constructed a perfect tetrahedron using four congruent equilateral triangles.

(名词) 四面体 【四面体(柏拉图立体之一)】

在几何课上,我们用四个全等的等边三角形构建了一个完美的四面体。

(sustantivo) tetraedro [Un poliedro con cuatro caras; el tetraedro regular, cuyas caras son triángulos equiláteros iguales, es uno de los sólidos platónicos.]

En la clase de geometría, construimos un tetraedro perfecto usando cuatro triángulos equiláteros congruentes.

(nom) tétraèdre [Polyèdre à quatre faces ; le tétraèdre régulier, dont les faces sont des triangles équilatéraux égaux, est l'un des solides de Platon.]

En cours de géométrie, nous avons construit un **tétraèdre** parfait avec quatre triangles équilatéraux congrus.

(Substantiv) Tetraeder; Vierflächner [ein geometrischer Körper mit vier dreieckigen Flächen; das regelmäßige **Tetrahedron**, dessen Flächen gleichseitige Dreiecke sind, zählt zu den platonischen Körpern.]

Im Geometrieunterricht haben wir aus vier kongruenten gleichseitigen Dreiecken ein perfektes **Tetrahedron** gebaut.

(名詞) 四面体(4つの面からなる多面体。正四面体は4枚の合同な正三角形からなり、プラトン立体の一つ)

幾何学の授業で、4つの合同な正三角形を使って完璧な四面体を作った。

(substantivo) tetraedro [Um poliedro com quatro faces; o tetraedro regular, cujas faces são triângulos equiláteros iguais, é um dos sólidos platônicos.]

Na aula de geometria, construímos um **tetraedro** perfeito usando quatro triângulos equiláteros congruentes.

Word parts: tetra + hedron

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