A cylinder and a cone have the same circumference and the same height. The volume of the cone is 1.8 cubic decimeters, what is the volume of the cylinder?
一个圆柱与圆锥底面周长相等、高也相等．圆锥的体积是1.8立方分米，圆柱体积是多少．
<gadget id="calculator">1.8 * 3</gadget>
<output>5.4</output>

<result>5.4</result>