A cylinder and a cone have the same body and base. The height of the cylinder is 3 cm. What is the height of the cone in cm?
一个圆柱和一个圆锥等体等底，圆柱的高是3厘米，圆锥的高是多少厘米．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>