Use two squares with a side length of 2 cm to form a rectangle. What is the area of the rectangle?
用两个边长2CM的正方形，摆一个长方形，长方形的面积是多少
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

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

<result>8</result>