A 36 decimeter long iron wire encloses a square, what is its area?
一根36分米长的铁丝围成一个正方形，它的面积是多少平方分米．
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>