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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 68

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 68 — /. \ > (pr. 26.) and m J = m (ax.): Therefore the oppofite fides and angles of the parallelo-gram are equal: and as the triangles \^ and \^ / are equal in every refpect (pr. 4,), the diagonal divides the parallelogram into two equal parts. Q. E. D. 36 BOOK I. PROP. XXXV. THEOR. … ARALLELOGRAMS on the fame bafe, andbetween the fame paral-lels, are [in area) equal. On account of the parallels,

Geometry

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