A 6-meter-long rope is tied to a cow and tied to a stake in the grass. What is the maximum area in square meters that the cow grazes?
一根长6米的绳子系着一头牛，栓在草地中的木桩上，牛吃草的面积最大是多少平方米？
<gadget id="calculator">3.14 * 6 * 6</gadget>
<output>113.04</output>

<result>113.04</result>