If the area of the triangle is equal to the area of the parallelogram and the height is the same, and the base of the parallelogram is 6 decimeters, then how many decimeters is the base of the triangle.
如果三角形的面积和平行四边形的面积相等，高也相等，平行四边形的底是6分米，那么三角形的底是多少分米．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>