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 324
. The square of P O is equal to the rectangle A O x O B, and also tothe rectangle F O X O G. But the former is equal tothe difference of the squares of D O and D B, andthe latter is equal to the difference of the squares ofC O and C G. Therefore these differences are equal,or what is the same, the…
Geometry
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