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An icosahedron has

  • A.12 triangular faces and 20 vertices
  • B.20 square faces and 8 vertices
  • C.8 triangular faces and 6 vertices
  • D.20 triangular faces and 12 vertices

Answer: D

An icosahedron is a polyhedron of 20 equilateral triangular faces with 12 vertices, and it shows 5-3-2 rotational symmetry. It is the shape that encloses the largest volume for a given number of identical subunits, which is why so many viruses adopt it.

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