Posted by maihul on .
Walking on the circumference of a circular field a man completes one round in 400 steps. If the length of a step of the man is 66cm., the radius of the field is 

math 
Reiny,
circumference = 2πr = 400(66) cm
r = 400(66)/(2π)
= 8403.38 cm
or appr 84 m