Question

The diameter of gardern roller is 1.4 meter and it is 2 meter long . How much area will it cover in 50 revolutions ?

Answer 1

Diameter = 1.4 m
Radius = 0.7 m

Length = 2 m
 Area in 1 revolution = CSA of the cylinder.
2πrh = 2 x 22/7 x 0.7 x 2 = 8.8 m²

Area covered in 50 revolutions = 50 x 8.8 = 440 m²

Hope This Helps You!

Answer 2

diameter = 1.4 m
radius , r = 1. 4 / 2 meter
length = 2 meter

Length of the cylinder is same as the height
Area covered in 1 revolution =C.S.A of a cylinder = 2πrh
= 2 × 22 / 7 × 1.4/2 × 2
= 8.8 m²
Area covered in 50 revolutions = 8.8 × 50
= 440m²