Maths question please help?

(1) How many meters of fencing do you need to go round the edge of a frog pond with two half circles and each end with a diameter of 10.5m and the side length of the pond is 90cm. (2) The frog pond has a depth of 10cm, how many cubic meters of water are needed to fill it? (3) How many litres are required to fill it? Thank you for all your help and please show working out.