After sawing a 2-meter-long log into three pieces, the surface area increases by 25.12 square decimeters. What is the volume of this log in cubic decimeters?
把一根长2米的圆木锯成三段后，表面积增加了25.12平方分米，这根圆木的体积是多少立方分米．
<gadget id="calculator">25.12 / 4</gadget>
<output>6.28</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">6.28 * 20</gadget>
<output>125.6</output>

<result>125.6</result>