triangle and a parallelogram have the same area and base, and the height of the parallelogram is 0.4 meters. What is the height of the triangle?
一个三角形和一个平行四边形面积和底都相等，平行四边形高0.4米，三角形的高是多少．
<gadget id="calculator">0.4 * 2</gadget>
<output>0.8</output>

<result>0.8</result>