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A hemispherical depression is cut from one face of a cubical block, such that diameter of hemisphere is equal to the edge of cube.

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A hemispherical depression is cut from one face of a cubical block, such that diameter  of hemisphere is equal to the edge of cube. Find the surface area of the remaining solid.

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Let the radius of hemisphere = r

Therefore,  r = I/2

Now, the required surface area = surface area of cubical block - Area of base of hemisphere + curved surface area of hemisphere 

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