Problem: the parameter of a square is equal to the perimeter of a rectangle of length 18 cm and breadth 10 cm . find the circumference of a semicircle whose diameter is equal to the side of the square . ( round off your answer to two decimal places ) ? 
Options: a ) 22.51 , b ) 22.0 , c ) 22.15 , d ) 22.17 , e ) 22.63
b