4.One day Raju was walking along a football ground win nis Tauler Tear his house in the evening. He saw a roller was lying on the field. Then he asked his father, how a roller is used to level a ground, length and radius of the roller is 14 m and 7m respectively i) What is the curved surface area of the roller? ii) If the length and breadth of the ground is 400 m and 120 m respectively, how many complete revolutions will it take to level the ground?
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