The diameter of a road roller is 60 cm and it is 140 cm long. It levelled an area of 79,200 cm2. How many turns did the road roller take to level the said area?
A road roller is cylindrical in shape.
Radius, r=602=30cm
Height, h=140cm
Curved surface area of the roller
=2πrh
=2×227×30×140
=26400 cm2
In 1 turn the roller will level 26,400 cm2 area.
Hence, no. of turns it will take to level 79,200 cm2 will be
n=79,20026,400=3