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1 The radius of a roller is 0.7\( \mathrm { m } \) and it is 2\( \mathrm { m } \) long. How much area will it cover in 10 revolutions A well 12\( \mathrm { m } \) deep with a diameter 3.5\( \mathrm { m } \) is dug up and earth from it is evenly spread to form a platform 10.5\( \mathrm { m } \) long and 8.8\( \mathrm { m } \) wide. Find the height of the platform.

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