Use a piece of rectangular cardboard with a length of 10 cm and a width of 8 cm to cut out the largest circle. What is the area of this circle in square centimeters?
用一块长10厘米，宽8厘米的长方形纸板，剪出一个最大的圆，这个圆的面积是多少平方厘米
<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>

<result>50.24</result>