a circular path of 20 m radius has marginal walk 2 m wide all round it . find the cost of leveling the walk at 25 p per m 2 ?
"explanation : π ( 22 ^ 2 - 20 ^ 2 ) = 22 / 7 * ( 484 - 400 ) = 264 264 * 1 / 4 = rs . 66 answer : option e"
multiply(25, subtract(circle_area(add(20, 2)), circle_area(20)))