Circle a has circumference numerically equal to its area. If the certain square has the same area with the circle a, then what would be the length of its sides?

Circle a has circumference numerically equal to its area. If the certain square has the same area with the circle a, then what would be the length of its sides?

A. $\pi \sqrt{2}$ C. $4 \sqrt{\pi}$
B. $\pi \sqrt{3}$ D. $2 \sqrt{\pi}$

Solution