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                                    The diameter of a road roller is 80 centimetres and it is 1.20 metres long:What is the area of levelled surface, when it rolls once? | 
                            
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Answer»  Radius of roller = 40 cm Length of roller (height) = 1.20 m = 120 cm Area of leveled surface, when it rolls once = Curved surface area of the roller = 2 × π × Radius × Height = 2 × 3.14 × 40 × 120 = 30144 cm2 = 3.0144 m2  | 
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