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 84
Thus: the right angled parallelogram ■be contained by the fides ■—^— and «-or it may be briefly defignated by is faid to If the adjacent fides are equal; i. e. ———— s ■—■■-■jthen —^—— • m ■ i which is the expreflion for the redlangle under is a fquare, and is equal to J and ■ or ■ or 52 BOOK II.…
Geometry
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