If a cylindrical piece of wood with a length of 5m and a bottom area of 12.56cm**2 is cut into 3 sections, how much does the surface area increase in cm**2?
一根长5m，底面积12.56cm**2的圆柱形木料，截成3段，表面积增加了多少cm**2．
<gadget id="calculator">12.56 * 4</gadget>
<output>50.24</output>

<result>50.24</result>