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 254
. 9). In the like manner it may be mown that BOOK VI. PROP. V. THEOR. 221 Therefore, the two triangles having a common bafe, and their fides equal, have alfo equal angles op- ^ =,¥a„d/l = W pofite to equal fides, i. e. s\ m (B. 1. pr. 8). But ^F = ^fc (conft.)and .*. z= mtk ; for the lame reafon m… … s\
Geometry
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