Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 70
he side, a c, equal to the side, df; then the third side ofone, b c, is equal to the third side of the other, ef; the angle at bis equal to the angle at e, and the angle at c is equal to the angleat/. For, if one triangle be applied to the other, the three points,b, a, c, coinciding with the three… … 142.—Proposition. The two angles at the base of an isocelestriangle are equal. Let ab c, {Fig. 100,) be an isoceles triangle,oC which the sides, a b and a c, are equal. Bisect the angle, {Art. 56 AMERICAN HOUSE-CARPENTER. 77,) b a c, by the line, a d. Then the Hne, h a, being equal tothe line, a 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-88-142.webp)
