An iron wire can just enclose a square with a side length of 4dm. If this iron wire encloses a rectangle with a length of 6dm, what is its area?
一根铁丝正好能围成一个边长为4dm的正方形，如果用这根铁丝围成长是6dm的长方形，它的面积有多大？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>