Find the volume of a cylinder which is 18cm in height and radius 10.5 cm.

10 An open rectangular cistern when measured outside is 1.35 m long 1.08m broad and 90cm deep and is made of iron which is 2.5cm thick. Find the capacity of the cistern and the volume of the iron used. 11 A field is 80m long and 50m broad. In one corner of the field, a pit which is 10m long, 7.5 m broad and 8m deep has been dug out. The earth taken out of it is evenly spread over the remaining part of the field. Find the rise in the level of the field. 13 How many cubic metres of earth must be dug out to since a well is 16m deep and which has a radius of 3.5m? If the earth taken out is spread over a rectangular plot of dimensions what is the height of the platform so formed? 14 An iron pipe is 21cm long and its exterior diameter is 8cm. If the thickness of the pipe is 1cm and iron weighs 8g/cm³. Find the weight of the pipe.