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 67
Since (pr. 29.) and ■—— common to the two triangles. … /. \ > (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.
Geometry
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