If a square of side length s is reshaped into a circle with radius r, with the perimeter of the original square equaling the circumference of the circle, what is the relationship between s and r?

a. s/r = \pi/2

b. s/r = \sqrt{\pi}

imo, both should be correct. However, Greg picked a as the answer. Isn’t the area of square and circle same if it’s “reshaped”?