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

<result>5</result>