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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 170

An illustration from 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, leaf 170 — N a given circ/e o to infcribe an equilateral and equi-angular pentagon. Conftrudl an ifofceles triangle, inwhich each of the angles at the bafefhall be double of the angle at thevertex, and infcribe in the given … ▲ 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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