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Bisectors of two adjacent angles A and B...

Bisectors of two adjacent angles A and B of a quadrilateral ABCD intersect each other at a point P. Which one of the following is correct?

A

`2 angle APB = angle C + angle D`

B

`angle APB = angle C + angle D`

C

`angle APB =180^(@) -(angle A + angle B)`

D

`angle APB =180^(@) - (angle C + angle D)`

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