The radical axis of two circles having centres at C1 and C2 and radii r1, r2 intersects the two circles
The radical axis of two circles having centres at C1 and C2 and radii r1, r2 intersects the two circles at two distinct points if
(1) C1 C2 = 0
(2) 0 < C1 C2 < | r1 – r2|
(3) C1 C2 = | r1 – r2|
(4) | r1 – r2| < C1 C2 < r1 + r2
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