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Question

A road roller takes 780 complete revolutions to level a road once. Find the area of the road if the diameter of a road roller is 42 cm.  [2 MARKS ]


Solution

Concept: 1 Mark
Application: 1 Mark

Radius of the road roller = r = 21cm = 0.21m

Diameter = d = 0.42m

Area of the road
=780(2πr)d 

=780[2×227×0.21×0.42]

=432.432 m2


Mathematics

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