A tetrahedron is a polyhedron composed of four triangular faces, three of which meet at each vertex.
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Sparky6953
Friday, April 20, 2012
Solar Energy - Cardboard Tetrahedron Pyramid and Perfect Circle Solar Collector Scrapbooking Triforce
A tetrahedron is a polyhedron composed of four triangular faces, three of which meet at each vertex.
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