rectangle with a length of 6 cm and a width of 4 cm is exactly surrounded by a piece of iron wire. If this wire is used to form a square, what is the area of the square?
用一根铁丝正好围成长是6厘米，宽是4厘米的长方形，如果用这根铁丝围成正方形，正方形的面积是多少？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

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

<gadget id="calculator">10 * (1/2)</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>