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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 166

An illustration from The first six books of the Elements of Euclid, in which coloured diagrams and symbols are used instead of letters .., 1847, leaf 166 — are equilateral parallelograms; ■■■■■«■■■■ and therefore if a circle be defcribed from the concourleof thefe lines with any one of them as radius, it will beinfcribed in the given fquare. (B. 3. pr. 16.) Q^E. D. *3+ BOOK IF. PROP. IX. PROS.

Geometry

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