A parallelogram, the base is enlarged by 3 times, the height is also enlarged by 3 times, how many times is the area enlarged
一个平行四边形，底扩大3倍，高也扩大3倍，面积扩大多少倍
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>