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 39
N the fame bafe (> ■), and on the fame fide of it there cannot be twotriangles having their conterminousfdes ( and ■-—■— , —■—■«—■» #«</ ■■»■■■■■») at both extremities of the bafe, equal to each other. When two triangles ftand on the fame bafe,and on the fame fide of it, the vertex of the… … and ▼ => but (pr. 5.) s which is abfurd, therefore the two triangles cannot have their conterminousfides equal at both extremities of the bafe. Q. E. D. BOOK I. PROP. VIII. THEOR.
Geometry
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