If a cylindrical piece of wood is cut into 3 sections, the surface area increases by 45.12 square centimeters. 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，表面积增加了45.12平方厘米，这根木料的底面积是多少平方厘米．
<gadget id="calculator">45.12 / 4</gadget>
<output>11.28</output>

<result>11.28</result>