A sheep is tied to a rope with a length of 3 meters, and it is tied to a grass field with a side length of 4 meters. What is the maximum area that the sheep grazes in square meters?
一根长3米的绳子系着一只羊，栓在边长是4米的草地里，羊吃草的面积最多是多少平方米？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * 9 * (1/4)</gadget>
<output>7.065</output>

<result>7.065</result>