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Let ABCD be a quadrilateral in which AB ...

Let ABCD be a quadrilateral in which AB is parallel to CD and perpendicular to AD, AB = 3CDand the area of the quadrilateral is 4 square units. If a circle can be drawn touching all the sides of the quadrilateral, then its radius is:

A

1

B

`sqrt5`

C

`sqrt2`

D

`sqrt3`

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The correct Answer is:
D
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