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 171
▲ circle a triangle ^^ equiangular to it; (B. 4. pr. 2.)^ and ^\ (B. i.pr.9.) Bifedl draw and Becaufe each of the angles A.^.A ^ and \\ are equal,the arcs upon which they ftand are equal, (B. 3. pr. 26.) and .*. and ....■■». which fubtend thefe arcs are equal (B.3.pr. 29.)and ,*, the pentagon is…
Euclid's Elements · Geometry
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