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The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to roll once over the play ground to level. Find the area of the play ground in m2 |
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Answer» Diameter of the roller = 84 cm Thus radius = 84/2 = 42 cm = 42/100 = 0.42m Length of the roller =120 cm = 120/100 = 1.2m It takes 500 complete revolutions to roll over the play ground. Thus 500 × L.S.A. of the roller = Area of the play ground ∴ Area of the play ground = 500 × 2πrh = 500 × 2 × 22/7 × 0.42 × 1.2 = 1584 m2 |
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