CBSE Class 8 Answered
A roadroller has radius 60cm and height 1.4m. It takes 500 revolution to plane a rectangular ground then what is area of rectangular ground
Asked by Siddhaling | 13 Jan, 2018, 07:23: PM
Expert Answer
Radius= 60cm
Height = 1.4m=140cm
Revolutions=500
CSA of cylinder=2×(22÷7)×r×h
CSA= 2×22÷7×140×60 cm2
No of revolution = area of field ÷ CSA of roadrolled
500 = area of field ÷ {2×22÷7×60×140}
Area =(500×2×22)÷(7×60×140)
Area = 2640000cm2 = 264m2
Answered by Arun | 14 Jan, 2018, 01:44: PM
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