There is a square playground in the school, its perimeter is 48 meters, what is the area in square meters?
学校有一块正方形操场，它的周长是48米，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>