If a 36 cm long wire is used to form the largest square, what is the area of the square in square centimeters?
用36厘米长的铁丝围成一个最大的正方形，这个正方形的面积是多少平方厘米．
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

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

<result>81</result>