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 401
e xxxvi, Ex. 6.] 76. Coaxal Circles. A system of circles is said to be coaxal whenthey have a common radical axis, Le, vv^hen the radical axis of each pairof circles of the system is the same. Since the radical axis of any pair of tlie circles is perpendicvdar to theline joining their centres, it… … then all the circles of the system intersect in the same two points, andany circle of the system is then obtained by taking a point O3 on theline of centres as centre, and the length of the straiglit line joiningthis point to the point P or Q as radius. The circles are then saidto be of the…
Euclid's Elements · Geometry · Mathematics, Greek
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