Question

The diameter of a roller is 2.5 m and its length is 1.4 m. How much area will it cover in 7 revolutions?​

Answer 1

Answer:

Mark it as brainliest.

Step-by-step explanation:

Radius = 1.25 m

height = 1.4m

C.S.A. OF CYLINDER = 2πRH

2 X 22/7 X 1.4 X 1.25

44/7 X 14X125/1000

44 X 2 X 125/1000

88 X 125/1000

11000/1000

11M^2

DISTAN CE COVER IN 7 REVOLUTIONS = 11 X 7

77 M^2

Answer 2

Answer: 145.67m^2

Explanation: We need to first find the radius of the cylinder.
So, radius(r) = diameter(d)/2
=> 2.5/2 = 1.25m.

Since the area of a cylinder = 2(pi)the+2(pi)r^2

Therefore, (a) of the cylindrical roller = 20.81m^2

And now, area of cylinder x 7 = total area the cylinder covered in 7 revolutions

=> 20.81 x 7 = 145.67m^2//

Hope this helps.
Thanks!