Two 6.28dm long iron wires, one enclosing a square and the other enclosing a circle, what percentage of the area of the square is the area of the circle?
两根6.28dm长的铁丝，一根围成正方形，一根围成圆，正方形的面积是圆面积的百分之几？
<gadget id="calculator">6.28 / 4</gadget>
<output>1.57</output>

<gadget id="calculator">1.57 ** 2</gadget>
<output>2.4649</output>

<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">2.4649 / 3.14</gadget>
<output>0.785</output>

<result>0.785</result>