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 292
F any fimilar reSlilinear figures be fimilarly deferibed on the fides of a right an- gled triangle ( ^•»^ ), the figure defer ibed on the fide (■....i ) fuh- tending the right angle is equal to thefutn of the figures on the other fides. … From the right angle draw to •> m. then ■■■■■•■■■MHB : ^_—i— perpendicular but (B. 6. pr. 8). (B. 6. pr, 20). (B. 6. pr. 20). • •ammmmmm%mmm Hence but +
Euclid's Elements · Geometry
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