Equilateral-triangles sentence example

equilateral-triangles
  • If the faces be all equal equilateral triangles the solid is termed the "regular" tetrahedron.
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  • If three equilateral triangles be placed at a common vertex with their covertical sides coincident in pairs, it is seen that the base is an equal equilateral triangle; hence four equal equilateral triangles enclose a space.
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  • In a similar manner, four covertical equilateral triangles stand on a square base.
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  • Five equilateral triangles covertically placed would stand on a pentagonal base, and it was found that, by forming several sets of such pyramids, a solid could be obtained which had zo triangular faces, which met in pairs to form 30 edges, and in fives to form 12 vertices.
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