what is 42-37 thanks.

http://www.google.com/#pq=circumference+of+a+circle&hl=en&sugexp=kjrmc&cp=5&gs_id=m&xhr=t&q=42-37&pf=p&sclient=psy-ab&source=hp&pbx=1&oq=42-37&aq=f&aqi=&aql=&gs_sm=&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=2196ee66493014b2&biw=711&bih=453