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In a scalene triangle ABC the altitudes ...

In a scalene triangle `ABC` the altitudes `AD & CF` are dropped from the vertices `A& C` to the sides `BC &AB.` The area of `Delta ABC` is known to be equal to 18, the area of triangle `BDF` is equal to 2 and length of segment `DF` is equal to `2sqrt2.` Find the radius of the circle circumscribed.

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