the inner circumference of a circular race track , 14 m wide , is 440 m . find radius of the outer circle ?
"let inner radius be r metres . then , 2 r = 440 ; r = = 70 m . radius of outer circle = ( 70 + 14 ) m = 84 m . answer : d"
add(14, divide(divide(440, const_pi), const_2))