Mathematics

Problem

A hollow cylindrical pipe is open at both ends. Which set of areas must be added to obtain its total surface area? a)

\text{Outer curved surface area} + \text{inner curved surface area}

\text{Outer curved surface area} + \text{area of both circular ends}

\text{Outer curved surface area} + \text{inner curved surface area} + \text{area of both annular rings at the ends}

\text{Outer curved surface area} + \text{inner curved surface area} + \text{area of both circular ends}