Question

the diameter of a roller is 84cm and it's length is 120cm. it takes 500complete revolutions to move once over to level a play ground. Find the area of the playground in square metre

Answer 1

r=0.42m
h=1.2m
CSA=2πrh
= 3.168m²
if takes 500 revolutions
= 3.168*500
=1584m²

Answer 2

Answer:

$\text{The area of playground is }1584m^2$

Step-by-step explanation:

Given the diameter of a roller is 84 cm and it's length is 120 cm. It takes 500 complete revolutions to move once over to level a play ground.

we have to find the area of playground

Diameter of roller=84 cm

Radius=42 cm=0.42 m

Height=120 cm=1.2 m

Curved surface area=2πrh=2(3.14)(0.42)(1.2)

                                 = 3.168 square meter

Now given if takes 500 revolutions   to move once over to level a play ground.

$\text{Total area=}3.168\times 500$

                         $=1584m^2$

$\text{The area of playground is }1584m^2$