Babbit, Arthur B · New York, H. Holt and company · leaf 183
des is a heptagon,one of eight sides is an octagon, one of nine sides is anonagon, and one of ten sides is a decagon. A regular polygon has all of its sides and all of itsangles equal. A polygon is irregular when either sides or anglesare unequal. CIRCLE A circle is a plane figurebounded by a… … FiG. 86 GEOMETRICAL DEFINITIONS 173
Mechanical drawing
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