A triangle and a parallelogram have the same height and the same area. If the base of the parallelogram is 6 cm, what is the base of the triangle in cm?
一个三角形和一个平行四边形高相等，面积也相等，如果平行四边形的底是6厘米，那么三角形的底是多少厘米．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>