Smart, Edward Howard · London : Macmillian and Co. · leaf 83
side both. (4) Describe a circle to cut a given circle orthogonally, and to passthrough two given points outside it. § 17. Def. Circles which have a common radical axis aresaid to be coaxal or to form a coaxal system. Since theradical axis is perpendicular to the line joining the centres ofany two… … Fig. 26. centre is X and radius equal to the tangent from X to any onecircle of the system cuts all the circles orthogonally. AVe can construct as many circles of the system as weplease by drawing tangents to this circle from points on the 56 PROJECTIVE GEOMETRY line of centres. The circle whose…
Geometry, Projective
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