parallelogram has the same area as a triangle, the base is the same length, and the height of the triangle is 20 cm. What is the height of the parallelogram in cm?
一个平行四边形与一个三角形的面积相等，底一样长，三角形的高是20厘米，平行四边形的高是多少厘米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>