The diameter of a roller is 91 cm and its length 100 cm. It takes 400 complete revolution to move once over to level a playground. Find the area of the playground in square metre.

The diameter of a roller is 91 cm and its length 100 cm. It takes 400 complete revolution to move once over to level a playground. Find the area of the playground in square metre.
1). 1032 m²
2). 1144 m²
3). 1232 m²
4). 1384 m²

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