If a cylinder with a height of 9 cm is cut into two cylinders and the surface area increases by 2.4 cm2, what is the volume of the original cylinder in cubic centimeters?
把一个高是9厘米的圆柱，截成两个圆柱后表面积比原来增加了2.4平方厘米，那么原来圆柱的体积是多少立方厘米．
<gadget id="calculator">2.4 / 2</gadget>
<output>1.2</output>

<gadget id="calculator">1.2 * 9</gadget>
<output>10.8</output>

<result>10.8</result>