Use two identical trapezoids to form a parallelogram. It is known that the area of each trapezoid is 8 square decimeters. What is the area of the assembled parallelogram?
用两个完全一样的梯形拼成一个平行四边形，已知每个梯形的面积是8平方分米，拼成的平行四边形的面积是多少平方分米？
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>