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 160
BOUT a givencircle O to circumfcribe a triangle equi-angular to a given triangle. … Produce any fide , of the given triangle both ways ; from the centre of the given circle drawany radius. Make ^ft = ^ and (B. I. pr. 23.) r=% At the extremities of the three radii, draw and .-.-...--, tangents to thegiven circle. (B. 3. pr. 17.) Zi The four angles of >^Wi ^B , taken together,…
Euclid's Elements · Geometry
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