Find the volume of the solid enclosed by the cylinder x^2+y^2=4, bounded above by the paraboloid z=x^2+y^2, an?

Find the volume of the solid enclosed by the cylinder x^2+y^2=4, bounded above by the paraboloid z=x^2+y^2, and bounded below by the xy-plane.( answer is 32/3 pi) I need clearer explanation!

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