Field diameters of 137 -- 150 metres ( 150 -- 160 yd ) are usual. ( 21 ) The perimeter of the field is known as the boundary .
This is sometimes painted and sometimes marked by a rope that encircles the outer edge of the field .
Field diameters of 137 -- 150 metres ( 150 -- 160 yd ) are usual. ( 21 ) The perimeter of the field is known as the boundary and this is sometimes painted and sometimes marked by a rope that encircles the outer edge of the field .