If two small squares with an area of 4 square centimeters are used to form a rectangle, what is the area of the rectangle?
用两个面积是4平方厘米的小正方形摆成一个长方形，长方形的面积是多少．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>