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 ( 22 / 7 ) r = 440 = r = ( 440 x ( 7 / 44 ) ) = 70 m . radius of outer circle = ( 70 + 14 ) m = 84 m . answer is a
add(14, divide(divide(440, const_pi), const_2))