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 playground. find the area of playground in m².

we are given

diameter=84cm

so,

radius =r=42cm

height=h=120cm

we know that

shape of roller is always in cylinder form

now, we can find surface area of cylinder

now, we can plug values

we know that

In one rotation , it covers area is 31667.25395 cm^2

There are 500 rotation

so, total area =

total area =

now, we need to change that area into m^2

we know that

now, we can multiply both sides 15833626.975

we get

so,

Area of playground is .............Answer

b. 10=9.1+0.2x

step-by-step explanation:

that's it