The volume of a cylinder is 84 cm**3, the area of the base is 21 cm**2, what is the height in cm?
一个圆柱体积是84厘米**3，底面积是21厘米**2，高是多少厘米．
<gadget id="calculator">84 / 21</gadget>
<output>4</output>

<result>4</result>