A piece of iron wire can form a square with a side length of 20 cm. This wire can form a rectangle with a width of 18 cm. What is the area of this rectangle?
一根铁丝可以围成一个边长为20厘米的正方形，用这根铁丝围成一个宽为18厘米的长方形，这个长方形的面积是多少？
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">40 - 18</gadget>
<output>22</output>

<gadget id="calculator">22 * 18</gadget>
<output>396</output>

<result>396</result>