Area of combination of solids (intermediate)

From a solid cylinder, a conical cavity of the same height and same radius is hollowed out.

Curved surface area of the cylinder and cone are $C{\text{cm}}^2$‍ and $D{\text{cm}}^2$‍ respectively.

Area of the circular base is $E{\text{cm}}^2$‍.

${\text{cm}}^2$‍