An icosahedron is any 20-sided polyhedron. A regular icosahedron has congruent 20 sides, 12 vertices and 30 edges. Each side is an equilateral triangle. The Euler-Descarte formula for an icosahedron is 12 + 20 - 30 = 2. The word 'icosahedron' comes from 'icos', which is derived from the Greek word for twenty and 'hedron', which comes from the Indo-European word for seat.
A geometric net is a 2-dimensional figure that can be folded into a 3-dimensional shape. Click for a geometric net you can fold into an icosahedron.
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