If the volume of a cone is 21 cubic centimeters, what is the volume of a cylinder with the same base and height as it?
一个圆锥的体积是21立方厘米，与它等底等高的圆柱的体积是多少立方厘米．
<gadget id="calculator">21 * 3</gadget>
<output>63</output>

<result>63</result>