A parallelogram and a triangle have the same base and the same area. If the height of the triangle is 9 cm, what is the height of the parallelogram in cm?
一个平行四边形与一个三角形等底且面积相等，如果三角形的高是9厘米，那么平行四边形的高是多少厘米．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

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