Question

The diameter and length of a roller is 120cm and 84cm respectively. To level the ground, 200 rotations of the roller are required

Answer 1

Answer:
Total Cost of leveling the ground = Rs. 6336
Step-by-step explanation:
Given: Diameter of Roller = 120 cm
           Length of Roller = 84 cm
           Rate to level the 1 m² ground = Rs. 10
To find: Total cost to level the ground.
Radius of roller, r =  
Height of roller, h = 84 cm
Surface area of Road leveled in 1 revolution = Curved surface area of cylinder
Surface area of Road leveled in 200 revolution
                                      = 200 × Curved surface area of cylinder
                                      =
                                      =
                                      =
                                      = 6336000 cm²
                                      = 633.6 m²  ()
Thus, Total Cost of leveling the ground = 633.6 × 10 = Rs. 6336
Therefore,  Total Cost of leveling the ground = Rs. 6336

Answer 2

Answer:

do you need total area of the ground??

here is your ans. :

given data ..........

• height = length of roller = 84
• rediius = 60

L.S.A of cylinder = 2πrh

= 2×(22/7) × 60 × 84

= 2×22×60×12

= 44×60×12

= 3168

total area of ground

= L.S.A of cylinder × no. of rotation

= 3168 × 200

= 633600 cm^2

........................HOPE IT HELPS YOU......................