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 69
ARALLELO- GRAMS 1 a equal bafes, and between thefame parallels, are equal. … Draw and ---..-— , »by (Pr- 34> and hyp.); = and II (pr- 33-) And therefore X is a parallelogram : but !->-■ (Pr- 35-) II (ax. 1.). Q. E. D. 38 BOOK I. PROP. XXXVII. THEOR.
Geometry
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