When you try to build shapes out of too many triangles, some bizarre things start to happen. Search. Pop ... and for an icosahedron there are 300 degrees where the 5 triangles meet at each vertex.

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Save guides, add subjects and pick up where you left off with your BBC account. A triangle is a polygon. It is a closed 3-sided shape made up of straight lines. The ‘tri-’ part of the word ...