Change a rectangular wire frame with a length of 12 cm and a width of 6 cm into a square? What is the area of the enclosed square in square centimetres?
把一个长12厘米，宽6厘米的长方形铁丝框改围成一个正方形？改围成的正方形的面积是多少平方厘米？
<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>