Question

A roller of diameter 70 cm and length 2m is rolling on the ground What is the area covered by the roller in 50 revolutions?

• A. $180m^2$
• B. $200m^2$
• C. $220m^2$
• D. $240m^2$

Answer 1

The correct option is C $220m^2$

Given diameter of roller 35 cm and length is 2 m

then radius of roller =$\frac{70}{2}=35cm=0.35m$

Then surface area of roller =$2\times \frac{22}{7}\times \left(0.35\right)\times 2=4.4m^2$

Then area cover by roller in 50 revolutions =$50times4.4=220sqm$