After a piece of cylindrical wood with a length of 2 decimeters is divided into two half cylinders along the diameter, the surface area increases by 8 square decimeters compared with the original one. What is the volume of this cylinder in cubic decimeters?
将一段长2分米的圆柱形木材沿着直径分成两个半圆柱后，表面积比原来增加了8平方分米，这个圆柱的体积是多少立方分米．
<gadget id="calculator">8 / 2 / 2</gadget>
<output>2</output>

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

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

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<result>6.28</result>