A piece of iron wire forms a rectangle with a length of 40 cm and a width of 20 cm. If this iron wire is re-enclosed into a square, what is its area?
把一根铁丝围成一个长方形，长40厘米，宽20厘米，如果把这根铁丝重新围成一个正方形，它的面积是多少平方分米？
<gadget id="calculator">40 + 20</gadget>
<output>60</output>

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

<gadget id="calculator">2 / 4 / 100</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">60 * (1/2) * 60 * (1/200)</gadget>
<output>9</output>

<result>9</result>