Smart, Edward Howard · London : Macmillian and Co. · leaf 82
cal axis of X and Z. .*. the three axes meet in a point. § 16. Hence we may construct the radical axis of twocircles which do not intersect. For if A and B (Fig. 25) be the circles, draw any circle Xcutting each of them. The common chords of X with A and B being the radicalaxes of X and A and X and… … PiO. 26. Two points being thus known, the radical axis can bedrawn. Since the radical axis is the locus of the intersection oftangents of equal length, it passes through the middle pointsboth of the direct and inverse common tangents. This pro-perty affords another construction for its position.…
Geometry, Projective
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