The lengths of two adjacent sides of a parallelogram are 12 cm and 4 cm respectively, the height of one of the bases is 9 cm, and the height of the other base is 9 cm.
一个平行四边形相邻两条边的长度分别是12厘米和4厘米，其中一条底边上的高是9厘米，另一条底边上的高是多少厘米．
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">36 / 12</gadget>
<output>3</output>

<result>3</result>