A parallelogram and a triangle have the same area and the same height and length. If the base of the triangle is 6 cm, what is the base of the parallelogram?
一个平行四边形和一个三角形面积相等，高一样长，如果三角形的底是6厘米，平行四边形的底是多少．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<result>3</result>