A road roller takes 400 revolution to level a ground. Find the area of the ground. Find the area of the ground if the diameter of road roller is 42 cm and length is 1.5 m.
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Revolution of road roller to level ground=400 revolution.
Diameter of road roller=42cm so radius=D/2 so,42/2 =21cm.
Length/height(A/Q)=1.5 m=150cm.
Now,
Volume of road roller=Πr^²h
= 22/7×(21)^²×150
=2,07,900cm
Hence,
Area of ground=400×2,07,900
=8,31,60,000cm/8,31,600m Answer
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