If a lamb is tied with a rope 1.6 meters long on the grass, what is the maximum area that the lamb can eat grass?
在草地上用一根长1.6米的绳子拴小羊，小羊能吃到草的面积最大是多少平方米？
<gadget id="calculator">1.6 ** 2</gadget>
<output>2.56</output>

<gadget id="calculator">3.14 * 2.56</gadget>
<output>8.0384</output>

<result>8.0384</result>