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 65
€4t ILEMBNTS … ^ut the base EA is equal to the base EB; therefore the angle AFE is equal (8. 4.) to the angle BFE. And when a straight line standing upon another makes the adjaci^nt angles equal to one anolher, each or themis a right (7. Def. 1.) angle: Therefore each of the angl^ AFE, BFE is a right an-gle;…
Euclid's Elements · Geometry · Trigonometry
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