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 263
• Draw any ftraight linemake —■ … and ; bifecl and from the point of bifedtion as a centre, and half the line as a radius, defcribe a femicircledraw —■—«— ———. r\ is the mean proportional required. Draw and
Geometry
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