Question

The diameter of a road roller is 140cm and its length is 2.2m. It takes 400 complete revolutions to move once over to level a stretch of road 2.2m wide. Find the surface area of the stretch of road leveled in m2. (Take  = 22) 7

Answer 1

heya dear!!

Diameter of a road roller =140cm=1.4m

Radius = 1.4/2=0.7m

Length =2.2 m

no. of revolutions =400

Area covered by the roller in 1 revolution=CSA of roller=2Πrh



Now,

Area covered by the roller in 400 revolutions=400×9.68=3872

which is the surface area of stretch of a road levelled.

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Answer 2

Answer:

Diameter of a road roller =140cm=1.4m

Radius = 1.4/2=0.7m

Length =2.2 m

no. of revolutions =400

Area covered by the roller in 1 revolution=CSA of roller=2Πrh

Now,

Area covered by the roller in 400 revolutions=400×9.68=3872

which is the surface area of stretch of a road levelled.

Step-by-step explanation: