Cut a square with a side length of 6 cm into the largest circle, by what percentage is the area reduced from the original?
把一个边长为6cm的正方形剪成一个最大的圆，面积比原来减少了百分之几？
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">36 - 28.26</gadget>
<output>7.74</output>

<gadget id="calculator">7.74 / 36</gadget>
<output>0.215</output>

<result>0.215</result>