A piece of square paper with a side length of 10 cm, if the largest circle is cut out from this paper, what is the utilization rate of this paper?
一张边长为10厘米的正方形纸，如果在这张纸上剪去一个最大的圆，这张纸的利用率是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

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

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">3.14 * (1/4) * 1</gadget>
<output>0.785</output>

<result>0.785</result>