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 109
from the centre draw to any point in meeting the circumference from the centre ;draw ——— and . Then = -^ (B. i.pr. 5.) but or CZ ^ (B. I. pr. 16.) (B. I. pr. 19.) but .*. every point in lies within the circle.Q. E. D. 76 BOOK III. PROP. III. THEOR. … Draw F a Jlraight line (drawn through the centre of a circle o bife£lsachord ( ••■) which does not pajs through the centre, it is perpendicular to it; or,if perpendicular to it, it bifeSls it. and to the centre of the circle. In >^ I and L..._V ■• •■ ■■» and ,*, m^^^ common, and = (B. 1. pr. 8.)…
Euclid's Elements · Geometry
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