Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 249
ebase from the opposite angle fall within the triangle, theangles at the base are of the same affection ; and if the per-pendicular fall without the triangle, the angles at the baseare of different aflection. Let ABC be a spherical triangle, and let the arch CD be drawn,from C perpendicular to the… … 2. Let CD fall without the triangle; then (14.) the angle B is ofthe same aftection with CD ; and the angle CAD is of the same affec-tion with CD; therefore the angle CAD and B are of the same af-fection, and the angle CAB and B are therefore of difterent aftections.f\ xf r\ Cor. Hence, if the…
Euclid's Elements · Geometry · Trigonometry
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