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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 168

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 168 — O conftruSl an ifofcelestriangle, in which each ofthe angles at the bafejliailhe double of the vertical angle. Take any fliaiwht line ^—and divide it fo that X = (B. 2. pr. I I.)With —I as radius, defcribe … o in it from the extremity of the radius,(B. 4. pr. i); draw Then \ and place \ is the required triangle. For, draw and defcribe O Since about ^I (B. 4. pr. ^.) X • ■■■■■ X ■ •— is a tangent to ( ) (B. 3. pr. 37.) .% m = ^ (B. 3. pr. 32), 136 BOOK IV. PROP. X. PROB. add ^F to each, ••• A + < = ^…

Euclid's Elements · Geometry

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