<image>Drought is very frightening, and people have started building reservoirs to collect rainwater and mitigate drought. Below is a type of reservoir that people have built. It has a diameter of 20 meters and a depth of 2.5 meters.
(1) What is the surface area of the land occupied by this reservoir?
(2) What is the area that needs to be cemented on the bottom and the walls of the reservoir?
(3) How many tons of water can this reservoir hold? (Each cubic meter of water weighs 1 ton)