Babbit, Arthur B · New York, H. Holt and company · leaf 187
176 MECHANICAL DRAWING … Fig. 92 A regular pyramid is apyramid whose base is aregular polygon the centerof which is in a perpen-dicular to the base let fallfrom the vertex. A pyramid is triangu-lar, pentagonal, octogonal,etc., as its base is a tri-angle, a pentagon, an oc-tagon, etc.The frustrum of a pyramid is the portion…
Mechanical drawing
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