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The tangents at two points A and B on th...

The tangents at two points A and B on the circle with the centre O intersects at P, if in quadrilateral `angleAOB : angleAPB = 5 : 1`, then the measure of `angleAPB` is____

A

`30^@`

B

`60^@`

C

`45^@`

D

`15^@`

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