The perimeter of a square vegetable field is 13.6 meters, what is its area in square meters?
一个正方形菜地的周长是13.6米，它的面积是多少平方米？
<gadget id="calculator">13.6 / 4</gadget>
<output>3.4</output>

<gadget id="calculator">3.4 * 3.4</gadget>
<output>11.56</output>

<result>11.56</result>