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 223
i22 PLANE TRIGONOMETRY. Produce the side AC to D, so that AD=AB; join BD, and dravr … AE, CF at right angles to it; from the centre C with the radius CDdescribe the semicircle GDH, cutting BD iu K, BC in G, and meet-ino* BC produced in H. It is plain that CD is the difference of the sides, and therefore thatBH is the base increased, and BG the base diminished by the differ-ence of…
Euclid's Elements · Geometry · Trigonometry
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