Cylinders and cones have the same base area and the same volume. The height of the cylinder is 15 cm, what is the height of the cone.
圆柱和圆锥底面积相等，体积也相等．圆柱的高是15厘米，圆锥的高是多少．
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>