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Area of combination of solids (intermediate)

Problem

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, start text, c, m, end text, squared and D, start text, c, m, end text, squared respectively.
Area of the circular base is E, start text, c, m, end text, squared.
Find the total surface area of the remaining block.
start text, c, m, end text, squared
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