The two adjacent sides of a parallelogram are 4dm and 6dm respectively, and the distance between one set of opposite sides is 4.5dm. What is the area of this parallelogram in dm**2.
一个平行四边形的两条邻边分别是4dm和6dm，其中一组对边的距离是4.5dm，这个平行四边形的面积是多少dm**2．
<gadget id="calculator">4 * 4.5</gadget>
<output>18</output>

<result>18</result>