the diameter of a roller is 70 cm and its length 1.12m. find the area of a playground, if it takes 250 complete revolutions to move once over the playground to level it.

Answer 1

One roll covers a rectangle of (70π by 1.12) m^2
= 78.4π m^2
we have 250 rotations, so the area
= 250(78.4π) = 19600π m^2

Answer 2

Bakvas pagal stupid