Cut off the largest circular iron plate from an iron plate with a length of 10 meters and a width of 8 meters. What is the area of the remaining iron plate in square meters?
在一块长10米，宽8米的铁板上截下一个最大的圆形铁板，剩下铁板的面积是多少平方米？
<gadget id="calculator">10 * 8</gadget>
<output>80</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">80 - 50.24</gadget>
<output>29.76</output>

<result>29.76</result>