Two circles of radii and are externally tangent to one another. A common external tangent line touches the two circles at points and respectively; and are the centres of the two circles.
Find the exact area of the quadrilateral .
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Two circles of radii and are externally tangent to one another. A common external tangent line touches the two circles at points and respectively; and are the centres of the two circles.
Find the exact area of the quadrilateral .
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