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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 137

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 137 — f FIE oppofite angles Afcand ^ j «l «/,/ o/~ tf«y quadrilateral figure in-ferred in a circle, are together equal totwo right angles. Draw and … the diagonals; and becaufe angles in the fame fegment are equal ^r — JP^ and ^r = ^f ; add ^^ to both. two right angles (B. 1. pr. 32.). In like manner it maybe fhown that, Q. E. D.

Geometry

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