A cylinder and a cone have the same height and volume, and the base area of the cylinder is 8.4 square decimeters. How many square decimeters is the base area of the cone?
一个圆柱与一个圆锥的高相等，体积也相等，已知圆柱的底面积是8.4平方分米，圆锥的底面积是多少平方分米．
<gadget id="calculator">8.4 * 3</gadget>
<output>25.2</output>

<result>25.2</result>