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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 33
BOOK I. •PROPOSITION I. PROBLEM. N a given finite Jlraight line ( ) to defcribe an equila- teral triangle. Defcribe I —J and © … (poftulate 3.); draw and —— (port. 1.). then will \ be equilateral. For -^— = (def. 15.); and therefore * \ is the equilateral triangle required. Q^E. D. BOOK I. PROP. II. PROB.Geometry
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