What is the area in centimeters of a square with a perimeter of 12 centimeters**2.
周长是12厘米的正方形的面积是多少厘米**2．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>