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 KC
Prove the point is the midpoint of a segment
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$\begingroup$
euclidean-geometry
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2midpoint of what? $[K,C]$ I guess!? – 2012-12-11
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0yes:) can you help me? – 2012-12-11