If a wire surrounds a square with a side length of exactly 3.14 meters, if it is rounded into a circle, what is the radius of the circle?
把一根铁丝围成一个正方形，边长正好是3.14米，如果把它改围成一个圆，这个圆的半径是多少．
<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<result>2</result>