If the area of a parallelogram is 41 square decimeters, what is the area of a triangle with the same base and height as it?
一个平行四边形的面积是41平方分米，与它等底等高的三角形的面积是多少平方分米．
<gadget id="calculator">41 / 2</gadget>
<output>41/2 = around 20.5</output>

<result>41/2 = around 20.5</result>