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[" 7.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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