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 291
F any fimilar rectilinear figures be fimilarly defer ibed on the fides of a right an- gled triangle ( /\ ), the figure defer ibed on the fide ( ) fub- tending the right angle is equal to thefum of the figures on the other fides. … From the right angle draw-to — then ••■»■ : .- (B. 6. pr. 8).
Geometry
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