Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 75
a triangle amount toa right angle, the remaining angle is a right angle. 153.—Corollary. If any two angles of a triangle are togetherequal to the remaining angle, that remaining angle is a rightangle. 154.—Corollary. If any two angles of a triangle are eachequal to two-thirds of a right angle, the… … Fig. 107. 156.—Proposition. If from the extremities of the diameter ofa semi-circle, two straight lines be drawn to any point in the cir-cumference, the angle formed by them at that point will be aright angle. Let ah c, {Fig. 107,) be a given semi-circle ; anda b and b c, lines drawn from the…
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-84-119.webp)
![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-32-39.webp)