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 54
104.— To make a circle equal to two given circles. Let Aand By (Fig. 71,) be the given circles. In the right-angled tri-angle, a b c, make a b equal to the diameter of the circle, B, andc 6 equal to the diameter of the circle, A ; then the hypothenuse. … . 78. 38 AMERICAN HOUSE-CARPENTER. a c, will be the diameter of a circle, C, which will be equal inarea to the two circles, A and JB, added together. Any polygonal figure, as A, (Fig. 72,) formed on the hypo-thenuse of a right-angled triangle, will be equal to two similarfigures,* as B and C*,…
Carpentry · Architecture
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