The area of a parallelogram is 180 square meters and its height is 9 meters. What is the base of this parallelogram in meters?
一个平行四边形的面积是180平方米，它的高是9米，这个平行四边形的底是多少米．
<gadget id="calculator">180 / 9</gadget>
<output>20</output>

<result>20</result>