A square vegetable field has one side against a wall and is surrounded by a 36-meter-long fence. What is the area of this vegetable field?
一块正方形的菜地，有一面靠墙，用长36米的篱笆围起来，这块菜地的面积是多少？
<gadget id="calculator">36 / 3</gadget>
<output>12</output>

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

<result>144</result>