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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 137

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 137 — Q. E. D. I04 BOOK III. PROP. XXI. THEOR. FIGURE I. … HE angles ( ^^ , ^^ ) in the fameJegment of a circle are equal. FIGURE I.Let the fegment be greater than a femicircle, anddraw —^^^— and ———— to the centre.

Euclid's Elements · Geometry

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