rope is 2.4 meters long, one end of which is tied to a stake, and the other end is tied to a sheep (the joints are not counted). How many square meters is the maximum area that this one can graze on the grass?
一根绳长2.4米，它的一头拴在木桩上，另一头拴着羊(接头出不计)．这只养在草地上吃草的最大范围是多少平方米．
<gadget id="calculator">2.4 ** 2</gadget>
<output>5.76</output>

<gadget id="calculator">3.14 * 5.76</gadget>
<output>18.0864</output>

<result>18.0864</result>