If a cylindrical steel material with a length of 9 decimeters is cut into two sections, the surface area is increased by 2.4d㎡, what is the original volume of the cylinder?
把一根长为9分米的圆柱形钢材截成两段，表面积比原来增加2.4d㎡，这根圆柱原来的体积是多少．
<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>