If a cylindrical piece of wood is cut into two sections, the surface area increases by 6.28 square decimeters, what is the area of the bottom of this piece of wood in square decimeters?
把一根圆柱形木料截成2段，表面积增加了6.28平方分米，这根木料的底面积是多少平方分米．
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<result>3.14</result>