The area of a parallelogram is 10 square meters, if the base and height are doubled, what is its area?
一个平行四边形的面积是10平方米，如果底和高都扩大到它的2倍，它的面积是多少平方米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>