Answers

2016-01-07T17:45:53+05:30
Radius = 0.84/2 = 0.42 m
height = 120 cm  = 1.2 m
So, CSA = 2πrh = 2* π * 0.42 * 1.2 = 31.680 m²
This is the area of taking one revolutio
Now, the area of taking 500 revolution = area of ground
so, area of ground = 31.68 * 500 = 5184 m²
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2016-01-07T17:49:36+05:30
Surface area of roller = 2πrh
= 2*22/7*42*120
=2*22*6*120
=12*22*120
=31680 cm^2
area of playground
= 500* 31680 = 1584000 cm^2
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