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

<result>18</result>