Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 217
f a pyramid were rolled on a flat surface its faces wouldcome iu contact with triangular areas such as shown for thesquare pyramid in Fig. 232. In this case there are four triangles.For a hexagonal pyramid there would be six triangles, etc. Thelength of the edges of the pyramid from the vertex to…
Mechanical drawing
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