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 164
And becaufe fl — ^ (conft.), and «•••»»••»•« zzz >■■■■■■■■■» g— »■■•■•■■•■■• (B. 1. def icV .*. = (B. i.pr. 4); and fince the adjacent fides and angles of the parallelo-gram S X are equal, they are all equal (B. 1. pr. 34); o and .*. S ^ ? inferibed in the given circle, is afquare. Q. £. D. 132…
Geometry
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