Two identical triangles form a parallelogram. Given that the area of each triangle is 14 square decimeters, what is the area of the resulting parallelogram?
两个完全一样的三角形拼成一个平行四边形．已知每个三角形的面积是14平方分米，拼成的平行四边形的面积是多少平方分米．
<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>