A parallelogram and a triangle have the same area and the same base. The height of the triangle is 9 cm. What is the height of the parallelogram in cm?
一个平行四边形和一个三角形面积相等，底也相等，三角形的高是9厘米，平行四边形高的是多少厘米．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>