Question

the diameter of a garden roller is 1.4m and it is 2m long. How much area will it cover in 5revolution?

Answer 1

diameter - 1.4 m
radius - 0.7 m
length h - 2 m
Covered area - Curved surface area ×no. of revolution
= 2pirh ×5
= 2 × 22÷7 × 0.7 × 2 × 5
= 8.8 × 5
= 44 m^2

Answer 2

d=1.4m
r=0.7m
h=2m
LSA of cylinder = 2πrh
=2×22/7×0.7×2
=88×0.1
=8.8m²
Area covered in 5 revolutions= 5× 8.8m²
=44m²
Hope it help you