A cylinder and a cone have the same base and height, and the volume difference between them is 0.8 cubic meters. What is the volume of the cone?
一个圆柱与一个圆锥等底等高他们体积相差0.8立方米，这个圆锥的体积是多少？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<result>0.4</result>