Cut out the largest circle from the center of a square aluminum plate with a side length of 6 decimeters, what percentage of the area of the original square is the remaining area?
从边长为6分米的正方形铝板中央剪下一个最大的圆，剩下的面积占原来正方形面积的百分之几？
<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>