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Let a circle (O) and a point A outside of the circle. AB, AC are tangents of (O) (B,C $\in$ (O)). BD is an diameter of (O). CK perpendicular to BD (K $\in$ BD). Let I is intersection of CK and AD. Prove that I is midpoint of KCenter image description here

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    midpoint of what? $[K,C]$ I guess!?2012-12-11
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    yes:) can you help me?2012-12-11

3 Answers 3