A rectangular frame with a length of 5dm and a width of 4dm is drawn into a parallelogram with a height of 4.5dm. What is the area of this parallelogram in dm**2.
将一个长是5dm，宽4dm的长方形框架拉成一个高4.5dm的平行四边形，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>