A cylindrical piece of wood is 20 decimeters long. If it is cut into 4 equal sections, the surface area increases by 18.84 square decimeters. What is the volume of each piece of cylindrical wood after cutting?
一根圆柱形木材长20分米，把它截成相同的4段，表面积增大了18.84平方分米，截后每段圆柱形木材的体积是多少．
<gadget id="calculator">18.84 / 6</gadget>
<output>3.14</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<result>15.7</result>