The figure below shows two concentric circle with centre O. PQRS a square, inscribed in the outer circle. It also circumscribes the inner circle, touching it at points B, C, D and A.
What is the ratio of the perimeter of the outer circle to that of polygon ABCD?
$\pi / 4$
$3 \pi / 2$
$\pi / 2$
Error(s) Found !!!