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Question


If COD=80, then CAD = ___.
  1. CBD
  2. 40
  3. 160
  4. COB


Solution

The correct options are
A CBD
B 40
Since the angle subtended by an arc at the centre of a circle is double the angle subtended by it at any remaining point on the circle, we have
COD=2×CAD.
Also, COD=2×CBD.
Thus, CAD=CBD=802=40.

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