A triangle and a parallelogram have the same area and the same base. If the height of the triangle is 18 cm, what is the height of the parallelogram in cm?
一个三角形与一个平行四边形面积相等，底也相等．如果，三角形的高是18厘米，那么平行四边形的高是多少厘米．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<result>9</result>