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 398
Fig. 1. Fig. 2. If the circles intersect in real points, P and Q, as in Fig. 1, the radical axis is clearly the straight line PQ. For if T be any point on PQ and TR and TS be the tangents from it to the circles, we have, by III. 36, TR2 = TP.TQ = TS2. If they do not intersect in real points, as in…
Euclid's Elements · Geometry · Mathematics, Greek
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