Cut the largest circle out of a square paper with a side length of 8 cm. By what percentage is the area of the circle reduced from the area of the original square?
在一个边长是8厘米的正方形纸上剪下一个最大的圆，圆的面积比原来正方形的面积减少百分之几？
<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">64 - 50.24</gadget>
<output>13.76</output>

<gadget id="calculator">13.76 / 64</gadget>
<output>0.215</output>

<result>0.215</result>