Uncle Li tied a sheep to graze on the grass with a 10-meter-long rope. What is the maximum area that the sheep can eat grass?
李大爷用一根10米长的绳子将一只羊拴在草地上吃草，这只羊能吃到草的最大面积是多少？
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>