Cut 4 equal circles from a square iron sheet with a side length of 8 meters. What is the remaining area of the iron sheet in cm**2.
在一块边长是8米的正方形铁皮上，剪下4个相等的圆，铁皮剩下的面积是多少cm**2．
<gadget id="calculator">8 * 8</gadget>
<output>64</output>

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

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

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

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

<result>13.76</result>