If the area of a triangle is 2.5 square decimeters, what is the area of the parallelogram with the same base and height as it?
一个三角形的面积是2.5平方分米，和它等底等高的平行四边行的面积是多少平方分米．
<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<result>5</result>