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 108
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. … F a jlraight line ( —— )drawn through the centre of a circle o SifecJs a chord ( ••) which does not pafs through the centre, it is perpendicular to it; or,if perpendicular to it, it bifeSls it. Draw and to the centre of the circle. In -^ I and | .„^S. common, and « ■ ■ ■ •. • ■ ■
Geometry
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