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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 50

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 50 — CZ Jk (pr. 16.) and in the fame manner it may be mown that any other two angles of the triangle taken together are lefs than two right angles. Q. E. D. D i8 BOOK I. PROP. XVIII. THEOR. … A

Geometry

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