A cylinder and a cone with the same base area, their volume ratio is 1:2, the height of the cone is 9 cm, what is the height of the cylinder in cm.
底面积相等的圆柱和圆锥，它们的体积比是1：2，圆锥的高是9厘米，圆柱的高是多少厘米．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 9</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>