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 91
bt E—i = C-J+ —+—+ B. twice > • ■—, Q. E. D. 58 BOOK 11. PROP. V. PROP. … F a Jlraightline be divided into two equalparts andalfo ^ into two unequal parts,the reSlangle contained bythe unequal parts, together with the fquare of the line betweenthe points of fe51 ion, is equal to the fquare of half that line +
Euclid's Elements · Geometry
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