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Two tangents to the circle x^2 +y^2=4 at...

Two tangents to the circle `x^2 +y^2=4` at the points A and B meet at point P(-4,0). The area of the quadrilateral PAOB in sq. units, where O is origin, is

A

`4sqrt2`

B

`6sqrt2`

C

`4sqrt3`

D

`8sqrt3`

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