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A circular grassy plot of land 42 m in d...

A circular grassy plot of land `42 m` in diameter has a path `3.5 m` wide running round it on the outside. Find the cost of gravelling the path at Rs 4 per square metre.

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A circular grassy plot of land 42m in diameter has a path 3.5m wide running round it on the outside.Find the cost of gravelling the path at Rs 4 per square metre.

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