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The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners (1847)

Byrne, Oliver, Whittingham, Charles, 1795-1876, Chiswick Press · London : William Pickering · leaf 51

An illustration from The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners, 1847, leaf 51 — ^Oi But, mik [= Mk (pr-16.) and in the fame manner it may be Ihown that any othertwo angles of the triangle taken together are lefs than tworight angles. Q;E. D. i8 BOOK I. PROP. XVIIL THEOR. … A

Euclid's Elements · Geometry

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