If the base of a parallelogram is 9 decimeters and the height is 4 decimeters, what is the area in square decimeters?
一个平行四边形的底是9分米，高是4分米，面积是多少平方分米．
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>