A cylinder and a cone have the same volume and base area. The height of the cone is 9 cm. What is the height of the cylinder in cm?
一个圆柱和一个圆锥的体积和底面积相等，圆锥高9厘米，圆柱的高是多少厘米．
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<result>3</result>