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 271
the extremities of •—i» and ^M^BHB and ————— _L to them and ^ draw and ——•.-—- refpedlively: complete the parallelograms^^^^H and I And fince, • BB««»»«B» (hyp.) (conft.) • H (B. 6. pr. 14), BOOK VI. PROP. XVI. THEOR. 237 that is, the redtangle contained by the extremes, equal tothe redangle… … fincethen
Euclid's Elements · Geometry
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