Problem: the area of a circular field is 17.56 hectares . find the cost of fencing it at the rate of rs . 2 per metre approximately
Rationale: "explanation : area = ( 17.56 x 10000 ) m 2 = 175600 m 2 . π r 2 = 175600 ⇔ ( r ) 2 = ( 175600 x ( 7 / 22 ) ) ⇔ r = 236.37 m . circumference = 2 π r = ( 2 x ( 22 / 7 ) x 236.37 ) m = 1485.78 m . cost of fencing = rs . ( 1485.78 x 2 ) = rs . 2972 . answer : option a"
annotated_formula: multiply(circumface(multiply(sqrt(divide(17.56, const_pi)), const_100)), 2)