The radius of the base of a cone is 3 times the radius of the base of a cylinder with the same height as it. It is known that the volume of the cylinder is 1.5 cubic decimeters. What is the volume of the cone?
一个圆锥体的底面半径是与它等高的一个圆柱体底面半径的3倍，已知圆柱体体积是1.5立方分米，圆锥体的体积是多少立方分米．
<gadget id="calculator">3 * 1.5</gadget>
<output>4.5</output>

<result>4.5</result>