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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 170

An illustration from The first six books of the Elements of Euclid, in which coloured diagrams and symbols are used instead of letters .., 1847, leaf 170 — ▲ circle a triangle equiangular to it; (B. 4. pr. 2.) ^ and m^ (B<IPr-9-) Bifedt draw and Becaufe each of the angles > +k and A are equal, the arcs upon which they ftand are equal, (B. 3. pr. 26.)and .*. i^—^— , ——■—■ , ■ , and ■■■■»«■ which fubtend thefe arcs are equal (B.3.pr. 29.)and .*.… … O defcribe an equilateraland equiangular penta-gon about a given circle O Draw five tangents through thevertices of the angles of any regularpentagon infcribed in the given o (B. 3. pr. 17).Thefe five tangents will form the required pentagon. Draw f— i In

Geometry

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