Question

There is a circular pond and foot - path runs along its boundry a man walks around it 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 wht is the diometer of the pond

Answer 1

$200 \times 55 = circumference \\ 200 \times 55 = 2\pi \times radius \\ 2\pi \times radius = 11000 \\ 2 \times radius = 11000 \div \pi$