A parallelogram and a triangle have the same base and the same area. The height of the parallelogram is 2.5 cm. What is the height of the triangle in cm?
一个平行四边形和一个三角形底相等，面积也相等，平行四边形高是2.5cm，三角形高是多少cm．
<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<result>5</result>