9    A road roller takes 750 complete revolutions to move once over to level a road. Find the area of the road if the diameter of a road roller is 84 cm and length is 1 m.

Area in one complete revolution of roller =  2πrh.

$= 2\Pi \times0.42\times1 = 2.638\ m^2$

So area of road  $= 2.638\ m^2\times 750 = 1979.20\ m^2$

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