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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 107
DEFINITIONS. 73 X. … equal angles. Circles which have the fame centre are called concentric circles.Geometry
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
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