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 70
ARALLELO-GRAMS 1 is* ( ^^ and ) on equal bafes, and between thefame parallels, are equal. … Draw and ---..-— , ■, by (pr. 34, and hyp.); = and II — (pr. 33.) And therefore but J1.1 is a parallelogram : (pr- 35-) (ax. I.). Q. E. D. 38 BOOK I. PROP. XXXFII. THEOR.
Euclid's Elements · Geometry
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