There is an iron wire 20 cm long, and it is surrounded by the largest rectangle. What is the area of this rectangle in square centimeters?
有一条长20厘米的铁丝，把它围成一个最大的长方形，这个长方形的面积是多少平方厘米．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>