A cylinder and a cone with the same base and height have a volume difference of 9 cubic centimeters. What is the volume of the cone in cubic centimeters?
等底等高的圆柱和圆锥，它们的体积相差9立方厘米，圆锥的体积是多少立方厘米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>