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 148
Also, as the arch BC to EF, so is the sector BGC to the sectorEHF. Join BC, CK, and in the arches BC, CK take any points X,O, and join BX, XC, CO, OK: Then, because in the triangles GBC,GCK, the two sides BG, GC are equal to the two CG, GK, and alsocontain equal angles; the base BC is equal (4. 1.)…
Euclid's Elements · Geometry · Trigonometry
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