The volume of a cone is 84 cubic centimeters, the area of the base is 21 square centimeters, and what is the height in centimeters.
一个圆锥的体积是84立方厘米，底面积是21平方厘米，高是多少厘米．
<gadget id="calculator">3 / 21</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">84 * (1/7)</gadget>
<output>12</output>

<result>12</result>