the area of a circular field is 13.86 hectares . find the cost of fencing it at the rate of rs . 4.80 per metre .
"explanation : area = ( 13.86 x 10000 ) sq . m = 138600 sq . m circumference = cost of fencing = rs . ( 1320 x 4.80 ) = rs . 6336 . answer : b ) 6336"
multiply(circumface(multiply(sqrt(divide(13.86, const_pi)), const_100)), 4.80)