A square vegetable field is surrounded by a 48-meter-long fence. What is the area of the vegetable field in square meters?
一块正方形菜地四周围了长48米的篱笆，这块菜地的面积是多少平方米？
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

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

<result>144</result>