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 87
HE 7-e£langle containedby two ftraight lines,one of which is dividedinto any number of parts. = <;+— /; equal to the fum of the reBangks contained by the undivided line, and the feveral parts of the divided line. I ——J—— i; Draw _L ——— and r= (prs.2.3.B.i.); complete the parallelograms, that is… … I I F a Jlraight line be dividedinto any tivo parts i , the fquare of the -whole lineis equal to the fum of the reSlangles contained by the whole line and each of its parts.
Euclid's Elements · Geometry
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