Asked by | 2nd Oct, 2008, 03:58: PM
Proof by contradiction :
Let the perpendicular not pass though the centre . Let O'(Red dot)be the centre then O"P is perpendicular to tangent at P . But at one point on the line you can not have 2 tangents .
So OP does pass through the centre O(Blue dot).
Answered by | 2nd Oct, 2008, 04:54: PM
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