A piece of iron wire just forms a rectangle with a length of 10 cm and a width of 2 cm. If this wire is used to form a square, find the area of the square.
一根铁丝正好围成一个长是10厘米，宽是2厘米的长方形，如果用这根铁丝围成一个正方形，求正方形的面积．
<gadget id="calculator">10 + 2</gadget>
<output>12</output>

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

<gadget id="calculator">12 * (1/2)</gadget>
<output>6</output>

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

<result>36</result>