A rectangular iron wire with a length of 12 cm and a width of 6 cm will now be changed into a square, find the area of the square.
一个长12厘米，宽6厘米的长方形铁丝，现将改成一个正方形，求正方形面积．
<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">18 * (1/2)</gadget>
<output>9</output>

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

<result>81</result>