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In the isosceles triangle OAB, O is the ...

In the isosceles triangle OAB, O is the origin, `OA=OB=6`. If the equation of side AB is `x-y+1=0`, then the area of the triangle OAB is (in square units)

A

`2sqrt21`

B

`sqrt142`

C

`(sqrt142)/2`

D

`sqrt71/2`

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The correct Answer is:
D
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