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 283
has to - to .„. a ratio compounded of the ratios of, and of ^^—— to —n^—»» . K K Q^E. D. 250 BOOK FT. PROP. XXIV. THEOR. … -B N any parallelogram (^7 /)the parallelograms ( r^i and ^ I ) which are aboutthe diagonal are Jimilar to the whole, andto each other.
Euclid's Elements · Geometry
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