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 32
an A. It is required lomake a triangle of which the sides shall be equal to A, B, C, each lotach. OF GEOMETRY. BOOK L 31 Take a straight line DEterminated at the point D,but unlimiled towards E)and make (3. 1.) DF equalto A, FG to B, and GHequal to C ; and from thecentre F, at the distanceFl),… … A-B- Because the point F is the centre of the circle DKL, FD is equal(11. De?.)lo FK; but FD is equal to the straight line A: thereforeFK is equal to A: Again^ because G is the centre of the circleLKH, GH Is equal (11. Def.) to GK: but GH is equal to C ; there-fore, alsuGK is equal to C; and FG is…
Euclid's Elements · Geometry · Trigonometry
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