A rope with a length of 125.6 decimeters goes around the trunk exactly 10 times. Ask: What is the cross-sectional area of the trunk in square decimeters?
一根长125.6分米的绳子，正好绕树干10圈，问：树干横截面面积是多少平方分米？
<gadget id="calculator">125.6 / 10 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<result>12.56</result>