The volume of a cylinder is that of a cone (3/2). The ratio of the radius of the base of the cylinder to the radius of the base of the cone is 1:2. It is known that the height of the cone is 18cm. Find the height of the cylinder.
一个圆柱的体积是一个圆锥的(3/2)，圆柱的底面半径与圆锥底面半径比是1：2，已知圆锥的高是18cm，求圆柱的高．
<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<result>36</result>