A cylindrical piece of wood has a base diameter of 4 decimeters and a height of 5 meters. If the wood is cut into 3 sections on average, will the surface area and volume change? If yes, has it increased or decreased? Increase (or decrease) by how much?
一根圆柱形木料底面直径是4分米，高是5米．如果把这根木料平均截成3段，表面积和体积有无变化？如果有，是增加了，还是减少了？增加(或减少)多少？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<result>50.24</result>