The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 25
. 16.) 43.—A polygon is a figure bounded by right lines. 44.—A regular polygon has its sides and angles equal. 45.—An irregular polygon has its sides and angles unequal. 46.—A trigon is a polygon of three sides, [Fig. 7 to 10;)a tetragon has four sides, [Fig. 11 to 16;) a pentagon has 12 AMERICAN…
Carpentry · Architecture
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