A parallelogram and a triangle have the same base and height. If the area of the triangle is 256 square decimeters, what is the area of the parallelogram?
一个平行四边形与一个三角形等底等高，若三角形的面积是256平方分米，平行四边形的面积是多少平方分米．
<gadget id="calculator">256 * 2</gadget>
<output>512</output>

<result>512</result>