A square lawn is 8 meters long. If a sheep is tied to a 3.5-meter-long rope to graze on the grass, how much grass can the sheep eat at most?
一块正方形草地，边长8米．用一根长3.5米的绳拴住一只羊到草地上吃草，羊最多能吃到多少面积的草？
<gadget id="calculator">3.5 ** 2</gadget>
<output>12.25</output>

<gadget id="calculator">3.14 * 12.25</gadget>
<output>38.465</output>

<result>38.465</result>