What is the area of a square with a perimeter of 12 cm?
周长12厘米的正方形，它的面积是多少平方厘米？
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

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

<result>9</result>