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Let ABCD be a quadrilateral with area 18...

Let ABCD be a quadrilateral with area 18, with side AB parallel to the side CD and AB = 2CD. Let AD be perpendicular to AB and CD. If a circle is drawn inside the quadrilateral ABCD touching all the sides, then its radius is :

A

3

B

2

C

`3/2`

D

1

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