Chambers DictionaryChamber's 20th Century Dictionary📕
tetrahedron tet-ra-hē′dron, n. a solid
figure enclosed by four bases or triangles.—adjs.Tetrahē′dral, having four sides:
bounded by four triangles; Tetrahexahē′dral.—n.Tetrahex′ahēdron, a solid of
twenty-four triangular faces. [Gr., tetra-, four, hedra, a
base.]
Wikipedia
A tetrahedron is a three dimensional shape. It has four corners. It looks like a pyramid. It has six equally long edges, four corners and four equilateral triangular faces. Every two edges meet on one of those corners forming a sixty-degree angle.
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