piece of iron wire can form a rectangle with a length of 8 cm and a width of 4 cm. If this wire is used to form a square, what is its area?
一根铁丝能够围成一个长8cm，宽4cm的长方形，如果用这根铁丝围成一个正方形，它的面积是多少平方厘米？
<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>