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 107
74 BOOK III. PROP. I. PROB. … O Jind the centre of a givencircle o Draw within the circle any ftraight Hne —^ drawhi left . ma ke. i^MMMi ^ and the point ofbiledtion is the centre. For, if it be pofTible, let any otherpoint as the point of concourfe of .^—— , ---..---and —.—— be the centre. Becaufe in
Euclid's Elements · Geometry
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