The first six books of the elements of Euclid : with a commentary and geometrical exercises ; to which are annexed a treatise on solid geometry, and short essays on ancient geometrical analysis, and the theory of transversals (1861)
Lardner, Dionysius, 1793-1859 · London : Print. for Taylor and Walton · leaf 234
ratio compounded of the ratios of AB to B C, and ofB D to B G. This proposition may be immediately inferred from (I). For sincethe angles are equal, the altitudes will be as the sides to which theyare not perpendicular. Proposition XXIV. Theorem. (641) In any parallelogram (A C) the parallelograms…
Geometry
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