Question

the roller which has diameter as 0.4 m is run on a garden of length 30 m how many times has it rolled

Answer 1

for l round =2πr= 2(3.14*0.4)

= 1.25(approx)

for 30 m= 30/1.25

=24

therefore, roller has rolled 24 times

Answer 2

$as \: we \: know \: lateral \:surface \: area \: of \: cylinder = 2\pi \times r \times h$

so

$2 \times \frac{22}{7} \times 0.2 \times 30 = 37.71$