The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 130
the circle. Wherefore, if any two points, etc, [q.e.d. lis EUCLIDS ELEMENTS. Proposition 3. Theorem. If a straight line drawn through the centre of a circle bisect astraight line in it which does not pass through the centre, it shall cutit at right angles ; and if it cut it at right angles, it… … Construction. Take E, the centre of the circle; and joinEA, EB. [III. L Proof. In the triangles AFE, BFE, (AF = FB, [Hypothesis. and FE is common,and the base EA = the base EB ; [I. Definition 15..-. the z.AFE = the ^BFE; [L 8. . •. these angles being adjacent, are right angles. [I. Def. 10..*. CD…
Euclid's Elements · Geometry · Mathematics, Greek
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