A triangle and a parallelogram have the same base and the same area. The height of the parallelogram is 6 cm. What is the height of the triangle?
一个三角形和平行四边形底相等，面积也相等，平行四边形的高是6厘米，三角形的高是多少．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>