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Question


If COD=80, then CAD = ___.

A
CBD
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B
40
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C
160
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D
COB
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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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