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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 176

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 176 — ateral [ triangles, hence ^^ = j ^r sr one-third of two right angles; (B. i. pr. 32) but ^L m = f I 1 (B. 1. pr. 13); /. ^ = W = ^W = one-third of I I 1(B. 1. pr. 32), and the angles vertically oppolite to theieare all equal to one another (B. 1. pr. 15), and ftand onequal arches (B. 3. pr. 26),… … O infcribe an equilateral andequiangular quindecagon ina given circle. and be the fides of an equilateral pentagoninfcribed in the given circle, andthe fide of an inscribed equi-lateral triangle. The arc fubtended by . and _____ _6_1 4 of the wholecircumference. The arc fubtended by 51 4 Their…

Geometry

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