On the two opposite vertices of a square with a side length of 12 meters, a sheep is tied to each side, and the length of the rope is 12 meters. What is the area of grass that two sheep can eat?
在一个边长是12米的正方形的两个相对的顶点上，各拴着一头羊，绳长为12米．两头羊都能吃到的草的面积是多少平方米？
<gadget id="calculator">12 ** 2</gadget>
<output>144</output>

<gadget id="calculator">144 / 2</gadget>
<output>72</output>

<gadget id="calculator">3.14 * 72</gadget>
<output>226.08</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<gadget id="calculator">226.08 - 144</gadget>
<output>82.08</output>

<result>82.08</result>