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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 172

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 172 — ir halves = &. alfo (__ sr _J|, and..»>•> common; and —■— rr —— ■—» twice —— ; In the fame manner it can be demonftratedthat ^—■---— — twice ——, In the fame manner it can be demonftrated that theother fides are equal, and therefore the pentagon is equi*lateral, it is alfo equiangular, for…

Geometry

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