If a cylinder of wood is cut into two identical half cylinders along the diameter, the surface area will increase by 18 square decimeters; if it is cut into three sections parallel to the bottom surface, the surface area will increase by 25.12 square decimeters, then the cylinder What is the surface area of the wood in square feet.
把一个圆柱体木料，如果沿着直径切成两个完全一样的半圆柱，表面积就增加18平方分米；如果将它与底面平行切成三段，表面积就增加25.12平方分米，则这个圆柱体木料的表面积是多少平方分米．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 * 3.14</gadget>
<output>28.26</output>

<gadget id="calculator">25.12 / 4</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">28.26 + 12.56</gadget>
<output>40.82</output>

<result>40.82</result>