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 125
er of both circles, which is abfurd. , let f j and I J Fig. 3. Next, if it be poffible touch externally in two points; draw —— joining the centres of the circles, and paffing through one of thepoints of contact, and draw —i——— and -^^—— , —-^ z= _ (B. I. def. 15.);nd ...«■■•. zr I (B. i. def. 15.);… … Thenand infcribed in a circle are e-qually dijiantfrom the centre;andalfofjlraight lines equallydijiafit from the centre are equal.
Euclid's Elements · Geometry
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