a circular path of 12 m radius has marginal walk 2 m wide all round it . find the cost of leveling the walk at 50 p per m 2 ?
"explanation : π ( 14 ^ 2 - 12 ^ 2 ) = 22 / 7 * 52 = 163.43 163.43 * 1 / 2 = rs . 81.72 answer : option c"
multiply(50, subtract(circle_area(add(12, 2)), circle_area(12)))