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 261
* ■«■■•••« (B. 6. pr. 2), and by compolition (B. 5. pr. 18); —^—> -■.- mmmmmm but mmm •■--•■ contains as often as contains the required part (conft.);■■■— is the required part. Q. E. D. 228 BOOK VI. PROP. X. PROB. … and draw
Euclid's Elements · Geometry
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