A cylindrical shape of wood, 2 meters long, after it is cut into two sections, the surface area increases by 25.12 square decimeters compared to the original. What is the original volume of this piece of wood in cubic decimeters?
一种圆柱形状的木材，长2米，把它横截成两段后，表面积比原来增加了25.12平方分米．这根木材原来的体积是多少立方分米．
<gadget id="calculator">25.12 / 2</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 * 2</gadget>
<output>25.12</output>

<result>25.12</result>