The diameter of the trunk of a large tree is 40 cm. A rope wraps exactly three times around the trunk of the tree. How long is the rope?
一棵大树的树干直径为40厘米，一个绳子绕这棵树的树干正好三圈，这根绳子有多长？
<gadget id="calculator">3.14 * 40 * 3</gadget>
<output>376.8</output>

<result>376.8</result>