A triangle and a parallelogram have the same base and height. If the area of the triangle is 25 square decimeters, what is the area of the parallelogram?
一个三角形和一个平行四边形等底等高，如果这个三角形的面积是25平方分米，那么这个平行四边形的面积是多少平方分米．
<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<result>50</result>