Cut out the largest circle from a square paper with a side length of 10 cm, what is the area of the remaining part?
把一张边长为10厘米的正方形纸剪去一个最大的圆，剩余部分的面积是多少．
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<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">100 - 78.5</gadget>
<output>21.5</output>

<result>21.5</result>