A triangle and a parallelogram have the same base and the same height. The area of the parallelogram is 56 square decimeters. What is the area of the triangle?
一个三角形与一个平行四边形同底等高，平行四边形的面积是56平方分米，三角形的面积是多少．
<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<result>28</result>