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 175
OF GEOMETRY. BOOK II. 175 AB, and BC produced, are in the same plane with the parts of themEC, EB, 3C (1. 2. Sup.). Therefore AB, CD, CB, are all in oneplane. Wherefore, xc. Q. K. I). Cor. It IS manifest, that any two straight lines wliich cut one an-,other are in one plane: Also, that any three…
Euclid's Elements · Geometry · Trigonometry
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