Question

A circular pond has a 90 cm wide foot path along its edges. A man walks around the outer edge of the foot path with 66cm long steps. In 400 steps he makes a full round of the pond. The radius of the circular pond in mts is

Answer 1

circumference = 2 * pie *r

here r = R+90 (R=radius of pond)

C = 400*66 = 26400  so

26400 = 2 * 22/7 *(R+90)

R = 4110