The height and area of a triangle and a parallelogram are equal, and the base of the parallelogram is 6 cm. What is the base of the triangle?
一个三角形与一个平行四边形的高和面积都相等，平行四边形的底是6厘米，则三角形的底是多少．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>