The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners (1847)
Byrne, Oliver, Whittingham, Charles, 1795-1876, Chiswick Press · London : William Pickering · leaf 134
F a Jlratght line be a tangent to a circle,thejiraight line , drawn perpendicular to it from point of the contact, pajfes through the centre of the circle. For, if it be pofTible, let the centre be without « and draw • ••- from the fuppofed centreto the point of contadl. Becaufe X
Euclid's Elements · Geometry
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