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 195
same straight lines in the plane opposite tothe base, are equal to one another. Let the parallelopipeds, CM, CN, be upon the same base AB,andof the same altitude, but their insisting straight lines AF, AG, LM,LN, CD, CE, BH, BK, not terminated in the same straight lines jthe solids CM, CN are equal… … plane LBHM is that in Mhich are the parallels LB, MHPQ (def. 5.o.Sup.), imd in which also is the figure BLPQ; and because the planeACDF is that in which are the parallels AC,FDOR,and in which alsois the figures CAOR; therefore the figures BLPQ,CAOR, are in pa.-rallel planes. In like manner, because…
Euclid's Elements · Geometry · Trigonometry
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