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 99
K are equal to the two CF, FK; and the base BK is equal tothe base KC; therefore the angle BFK is equal (8. 1.) to the angleKFC, and the angle BKF to FKC; wherefore the angle BFC isdouble of the angle KFC, and BKC double of FKC: for the samereason, the angle CFD is double of the angle CFL, and CLD… … eqtia to tlip anz\e CFL; now theright aniile FCK is equal to the rightan2;le FCL; Hn<l therefore in thetwo triangles FKC, FLC, there aretvvi) ariLiles of one equal to two an-gles ol the other, each to each, midthe side FC, vvtiich is adjacent tothe Cijual anjjies in each, is commonto both ;…
Euclid's Elements · Geometry · Trigonometry
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