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 100
+ * by By pr. 4, B. 2. -„..* = 2 _j 3 _|_ 2 „ . add -^—— 2 to both 2 + 2 = 8 (pr.47fB.i.) 2 • + + ■ or + (pr. 47, B. 1.). Therefore, » = 2 • ■ ~ : hence ■by 2 +- + + Q. E. D. 68 BOOK II. PROP. XIII. THEOR. FIRST SECOND.
Geometry
Internet Archive · Thomas Fisher Rare Book Library · Public Domain Mark 1.0. Free to use for anything.
