A wire is 12 decimeters long, and it is surrounded by a square. What is the area of the square?
一根铁丝长12分米，把他围成一个正方形，这个正方形的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>