If a cylindrical piece of wood is cut into 3 sections, the surface area increases by 12.56 square centimeters compared to the original one. What is the area of the bottom of this piece of wood in square centimeters?
把一根圆柱形木料截成3段，表面积比原来增加了12.56平方厘米，这根木料的底面积是多少平方厘米．
<gadget id="calculator">12.56 / 4</gadget>
<output>3.14</output>

<result>3.14</result>