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 43
( ; a perpendicular. ROM a given point (^—™)> in a given Jlraight line —), to draw … Take any point (■cut off ■ ) in the given line,— (Pr- 3-)» A conftrucl: £_ \ (pr. i.), draw and it fhall be perpendicular to the given line. For (conft.) (conft.) and common to the two triangles. Therefore Jj ~
Geometry
Internet Archive · Thomas Fisher Rare Book Library · Public Domain Mark 1.0. Free to use for anything.