A cylinder and a cone have the same base radius and volume. The height of the cylinder is 6 cm. What is the height of the cone?
一个圆柱和一个圆锥底面半径和体积都相等，圆柱的高是6厘米，圆锥的高是多少．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>