Question

a park a park is in the shape of the circle and a person walking on the boundry covers a distance of 440 m in one round .find the diameter of the park and also the cost of covering it with gravel at the rate of 225permetresquare

Answer 1

$2\pi \: r = 440 \\ \pi \: r \: = 220 \\ r = 220 \div \pi \\ diameter = 2(220 \div \pi)$