Volume and Surface Area of Solids

The Mayflower Street 21  playground is undergoing some renovation works and getting ready for a brand new look.
You have been roped in as designers and contractors for this very task!

You will be building a children's tunnel in the shape of a cylindrical hollow tube and a children's playhouse in the shape of a cuboid with a roof in the shape of a triangular prism. The children in the neighbourhood are looking forward to their brand new playground!

All the best in your task! Please read on.