Question

There is a circular pond and footh path runs along its boundary . A man walks exactly once keeping close to the edge . If his step is 55 cm long and he takes exactly 400 steps to go round the pond,what is the diameter of the pond?

Answer 1

total (n=400 steps)
1 step = 55 cm
then
total steps is 400×55=22000
then,
2πr=22000
πr=11000
r=11000×7÷22
r=3500cm
then
diameter=7000cm