cylinder and a cone have the same base area and volume. The height of the cylinder is 18 cm. What is the height of the cone in cm?
底面积和体积都相等的圆柱和圆锥，圆柱的高是18厘米，圆锥的高是多少厘米．
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>