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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 88

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 88
I + In a limilar manner it may be readily mown Q.E.D 56 BOOK II. PROP. IV. THEOR. … F a Jlraight line be dividedinto any two parts > , the fquare of the whole lineis equal to the fquares of the parts, together with twice the rectangle contained by the parts.

Geometry

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