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 110
F in a circle tiaojlraight linescut one another, which donot both pafs through thecentre, they do not bifeSl one another. If one of the lines pafs through thecentre, it is evident that it cannot bebifecfted by the other, which does notpafs through the centre. … But if neither of the Hnes —=—^^— or •—^-i—pafs through the centre, draw ——----.from the centre to their interfedlion. If «i^^^ be bileded, ._._._ _L to it (6. 3. pr. 3.).*. ^^ = I ^ and if — be bifed:ed, (B. 3- P-- 3-) and .*, 5 a part equal to the whole, which is abfurd :.*. ———— and ———• do not…
Euclid's Elements · Geometry
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