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 128
e whole triangle ABC, andto one another. Because the angle BAG is equal to the angle ADB, each of thembeing a right angle, and the angleat B common to the two trianglesABC, ABD; the remaining angleACB is equal to the remaining an-gle BAD (32. 1.): therefore thetriangle ABC is equiangular to… … lis ELEMENTS giilar anil similar to the triangle ABC: and the triangles ABD, ADC,being each equiangular and similar to ABC, are equiangular and simi-lar to one another. Therefore, in a right angled, &c. Q. E. D. Cor. From this it is manifest, that the perpendicular drawn, fromthe right angle of…
Euclid's Elements · Geometry · Trigonometry
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