An iron wire can form a square with a side length of 13 cm. If this iron wire forms the largest rectangle, what is the area of the rectangle?
一根铁丝可以围成一个边长是13厘米的正方形，如把这根铁丝围成一个最大的长方形，长方形的面积是多少？
<gadget id="calculator">14 * 12</gadget>
<output>168</output>

<result>168</result>