A triangle and a parallelogram have the same area and the same base. If the height of the parallelogram is 6 cm, what is the height of the triangle?
一个三角形与一个平行四边形的面积相等，底也相等．平行四边形的高是6厘米，那么三角形的高是多少厘米．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>