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The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners (1847)

Byrne, Oliver, Whittingham, Charles, 1795-1876, Chiswick Press · London : William Pickering · leaf 300

An illustration from The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners, 1847, leaf 300 — IHE reStangle contained by the diagonals of a quadrilateral figureI infcribed in a circle, is equal to\ both the reBangles contained by its oppoftte Jides. / /be any quadrilateral / o fieure infcribed in and draw … and then X X Make ^k = W (B.i.pr. 23),^ = ^ ; and

Euclid's Elements · Geometry

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