A piece of iron wire can make a rectangle with a length of 2 decimeters and a width of 80 cm. If this wire is used to make a square, what is the area of the square?
一根铁丝能做一个长2分米，宽80厘米的长方形，如果用这根铁丝做一个正方形，那么这个正方形的面积是多少？
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 + 80</gadget>
<output>100</output>

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

<gadget id="calculator">100 * (1/2) * 100 * (1/2)</gadget>
<output>2_500</output>

<result>2_500</result>