The American house carpenter: a treatise upon architecture, cornices and mouldings, framing, doors, windows and stairs. Together with the most important principles of practical geometry (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 46
dodecagon may be formed by bisecting the sides of the hexagon. Each side of a regular hexagon is exactly equal to the radiusof the circle that circumscribes the figure. For the radius isequal to a chord of an arc of 60 degrees ; and, as every circle issupposed to be divided into 360 degrees, there… … 30 AMERICAN HOUSE-CARPENTER. 94.— Within a square to inscribe an octagon. Let a b c d,{Fig. 55,) be the given square. Draw the diagonals, a d and6c; upon a, 6, c and c?, with a e for radius, describe arcs cut-ting the sides of the square at 1, 2, 3, 4, 5, 6, 7 and 8 ; join 1and 2, 3 and 4, 5 and 6,…
Carpentry · Architecture
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