A rectangle with a perimeter of 24 cm is surrounded by a piece of iron wire. If these wires are used to form a square, what is the area of the square?
用一根铁丝围成一个周长是24厘米的长方形，如果用这些铁丝围成一个正方形，那么正方形的面积是多少？
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

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

<result>36</result>