Question

A roller is in shape of cylinder of length 20m and grith 14m if it takes 42 revolution to label the ground then find the area of the field

Answer 1

length = height = 20m
grith= diameter= 14m
radius = 7m
Area covered in one revolution=CSA=
$2\pi \: rh$
$2 \times \frac{22}{7} \times 7 \times 20 \\ = 880 {m}^{2}$
Area covered in 42 revolution=
42 × CSA
42 × 880
= 36960 m^2