Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 52
104.— To make a circle equal to two given circles. Let Aand jB, [Fig. 71,) be the given circles. In the right-angled tri-angle, ah c, make a h equal to the diameter of the circle, B, andc b equal to the diameter of the circle, A ; then the hypothenuse, … Fig. 72. 38 American house-carpenter. a c, will be the diameter of a circle, C, which will be equal in area to the two circles, A and i?, added together. Any polygonal figure, as J[, {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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![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-86-129.webp)
