A 3-meter-long cylindrical steel bar is cut into two sections, and the surface area increases by 12.56 square decimeters. What is the volume of this bar in cubic decimeters?
一根3米长的圆柱形钢条，把它截成2段，表面积增加了12.56平方分米．这根钢条的体积是多少立方分米？
<gadget id="calculator">12.56 / 2</gadget>
<output>6.28</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">6.28 * 30</gadget>
<output>188.4</output>

<result>188.4</result>