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 55
Fi-. 71. 104.— To make a circle equal to two given circles. Let Aand B^ {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, and0 b equal to the diameter of the circle, A; then the hypothenuse. … Fig. 78. AMERICAN HOUSE-CARPENTER. 40 a c, will be the diameter of a circle, C, which will be equal in area to the two circles, A and B^ 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
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-87-132.webp)
