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
STRAIGHT line ( ■■ )joining two points in thecircumference of a circle , lies wholly within the circle. Find the centre of o (B.3.pr.i.); … from the centre draw to any point in meeting the circumference from the centre ;draw and ■ . Then = ^ (B. i.pr. 5.) but or \ (B. i.pr. 16.)- (B. 1. pr. 19.) but .*. every point in lies within the circle.Q. E. D. 76 BOOK III. PROP. III. THEOR.
Geometry
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