Let \( A B C D \) be a quadrilateral with area 18, side \( A B \) parallel to the side \( C D \)...

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Let \( A B C D \) be a quadrilateral with area 18, side \( A B \) parallel to the side \( C D \), and \( A B=2 C D \). Let \( A D \) be perpendicular to \( A B \) and \( C D \). If a circle is drawn inside the quadrilateral \( A B C D \) touching all the sides, then its radius is
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