Answer :

Given, diameter = 84cm = 0.84m i.e r = 0.42m

Length h = 120cm = 1.20m

Number of revolutions n = 500

Area of the playground = n × curved surface area of the roller

= 500 × 2πrh

= 500 × 2 × 3.14 × 0.42 × 1.2

= 1582.56m^{2}

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