A parallelogram with an area of 5 square centimeters, if the base and height are doubled, what is its area?
一个平行四边形，面积是5平方厘米，如果底和高都扩大2倍，它的面积是多少平方厘米．
<gadget id="calculator">5 * 2 * 2</gadget>
<output>20</output>

<result>20</result>