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 41
5 and they aretlierefore equal to one another. But, if the sides AD, EF, opposite to the base BC of the parallelo-grams ABCD, EBCF, be not terminated in the same point; then,because ABCD is a parallelogram, AD is equal (34. 1.) to BC; forthe same reason EF is equal to BC: wherefore AD is equal (l.…
Euclid's Elements · Geometry · Trigonometry
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