If two squares with a side length of 2 decimeters are used to form a rectangle, what is the area of the rectangle?
用两个边长2分米的正方形拼成一个长方形，这个长方形的面积是多少平方分米
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>