The volume and base area of a column and a cone are equal respectively. It is known that the height of the cylinder is 6 cm. What is the height of the cone in cm?
一个图柱和一个圆锥的体积和底面积分别相等，己知圆柱的高是6cm，圆锥的高是多少cm．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>