Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 165
5. The icosacdron, is a solid, bounded by twenty equaequilateral triangles. … G. The regular solids may easily be made of pasteboard. Draw the figures of the regular solids accurately on pasteboard, and then cut through the bounding lines : this will givefigures of pasteboard similar to the diagrams. Then, cutthe other lines half through the pasteboard, after which, turnup…
Geometry · Plane trigonometry
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