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In a circle with centre O, AB is a diame...

In a circle with centre O, AB is a diameter and CD is a chord which is equal to the radius OC. AC and BD are extended in such a way that they intersect each other at a point P, exterior to the circle. The measure of `angleAPB` is

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`90^(@)`

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