The area of a parallelogram is 12m**2, the base and height are doubled, what is the area in meters**2.
平行四边形的面积是12米**2，底和高都扩大2倍，面积是多少米**2．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>