What is the area of a square surrounded by a 12dm long wire?
用一根12dm长的铁丝围成的正方形面积是多少平方分米．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

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

<result>9</result>