If a cylinder is sawn into two pieces along the direction parallel to the bottom surface, the surface area will increase by 6.28 square decimeters. If it is sawn into two equal pieces along the diameter of the bottom surface, the surface area will increase by 8 square decimeters. What is the volume of the cylinder in cubic decimeters?
一个圆柱，如果沿着与底面平行的方向锯成两段，表面积就增加了6.28平方分米，如果沿着底面直径锯成相同的两块，表面积就增加了8平方分米．圆柱的体积是多少立方分米？
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">8 / 2 / 2</gadget>
<output>2</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>