The area of the parallelogram formed by two identical triangles is 56 square decimeters, what is the area of one of the triangles?
两个完全一样的三角形拼成的平行四边形的面积是56平方分米，其中一个三角形的面积是多少平方分米．
<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<result>28</result>