Cut a piece of paper with a side length of 10 cm into the largest circle, what percentage of the area of the circle is the area of the square?
把一张边长10厘米的正方形的纸剪成一个最大的圆，这个圆的面积是正方形面积的百分之几？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">78.5 / 100</gadget>
<output>0.785</output>

<result>0.785</result>