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 59
^Im- ^, C or H] ^^ ^^^ is not equal to ^^^^ •=. ^^ then ^^^^ := ——i- (pr. 4.) for if which is contrary to the hypothefis;^H^ is not lefs than ^^ for if A :ti A then i H (pr. 24.), which is alfo contrary to the hypothefis: /.A [= A. Q^E. D. 26 BOOK I. PROP. XXVL THEOR. Case I. … F two triangles have two angles of the one re- fpedlively equal to two angles of the other.
Euclid's Elements · Geometry
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