A rope 50.24 meters long wraps exactly 8 times around a tree trunk. What is the cross-sectional area of the trunk in square meters?
一根长50.24米的绳子，正好绕一棵树干8圈，树干横截面的面积是多少平方米？
<gadget id="calculator">50.24 / 8 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>