Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 135
, for instance in G and II ; then, the three lines AB, GD, FH,would he equal (Prop. XII.): but the lines AB, CD, EF, arealready known to be equal; hence CD = GD, and FII = EF,which is absurd ; hence the plane ACE is parallel to BDF. Cor. If two [)arallfl pianos MX, PQ are met bv two otherplanes… … PROPOSITION XIV. THEOREM. If three straight lines, not situatrd in the same plane, are eqnal(nul parallel, the opposite triauL^les formed hy join inî: the er-tremitirs of these lines will be equal, and their planes will Iteparallel. ^36 GEOMETRY. Let AB, CD, EF, be thelines. Since AB is equal…
Trigonometry · Geometry
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