How to make a Pyramid from cardboard and a Perfect Circle

Published on Apr 15, 2012 by GREENPOWERSCIENCE
Solar Collector DIY Tetrahedron.
A tetrahedron is a polyhedron composed of four triangular faces, three of which meet at each vertex.

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Bio: You may recognize Dan and Denise Rojas from their appearances in various made for tv movies and national commercials. As the hosts of Green Power ... More »
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