find the cost of fencing around a circular field of diameter 39 m at the rate of rs . 1.50 a meter ?
"2 * 22 / 7 * 19.5 = 122.6 122.6 * 1 1 / 2 = rs . 128.73 answer : e"
multiply(circumface(divide(39, const_2)), 1.50)