ICSE Class 10 Maths Surface Area of a Cylinder

A wire of diameter 2mm is to be wound around a cylinder of 70mm diameter and 20cm height. If the wire is to be wound in such a manner that there is no gap between consecutive turns of the wire,what length of wire will be required for covering the entire cylinder?
 The radius of a roller is 35 cm and its length is 3 m. If it takes 30 revolutions to level a playground, find: a) the are of the playground b) the cost of levelling the ground at rs 5 per m2.
 A cylindrical glass of 6 cm hright has a radius of 3.5 cm. find the wet surface areaof the glass when water is poured into it.

two right circular solid cylinder have radii in the ratio 3:5 and height in the ratio 2:3.find the ratio between their:curved surface area and volume
 a closed cylindrical tank made of thin iron sheet has diameter = 8.4 m and height = 5.4 m. how much metal sheet, to the nearest sq. m, is used in making this tank, if 1/15 of the sheet actually used was wasted in making the tank