The base and height of a parallelogram are enlarged to 3 times of the original, and the area is enlarged to how many times of the original.
一个平行四边形的底和高都扩大到原来的3倍，面积扩大到原来的多少倍．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>