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An inverted cone of vertical height 12cm...

An inverted cone of vertical height `12cm` and the radius of base `9cm` contains water to a depth of `4cm`. Find the area of the interior surface of the cone not in contact with the water. Use `pi=22/7`
(A) `402.12cm^(2)`
(B) `298cm^(2)`
(C) `377.14cm^(2)`
(D) `315cm^(2)`

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