The first six books of the Elements of Euclid, in which coloured diagrams and symbols are used instead of letters .. (1847)
Euclid, Byrne, Oliver · London, W. Pickering · leaf 98
t =^=i half a right angle (prs. 5, 32, 29, 34, B. 1.), and .___ — «...•■■■» ... — ■ — — _..-..., (prs. 6, 34, B. 1.). Hence by (pr. 47, B. 1.) Q. E. D. K 66 BOOK II. PROP. XL PROB.
Geometry
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