hkus10 Posted January 21, 2011 Posted January 21, 2011 Let C1 and C2 be circles in the plane. Describe the number of possible points of intersection of C1 and C2. It is 4?
imatfaal Posted January 21, 2011 Posted January 21, 2011 Well for a start it could be zero - ie they are miles apart or concentric. I would ask myself some questions - does it matter what relative size - if Yes - why, what ramifications; if No move on. How can two circles be related - how many intersections do each have.
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