If a piece of cylindrical wood is divided into two cylindrical pieces, its surface area will increase by 6.28 square decimeters; if it is split into two half cylinders along the diameter, its surface area will increase by 80 square decimeters. What is the surface area of the original cylinder.
一段圆柱体木料，如果分成两块圆柱体木料，它的表面积增加了6.28平方分米；如果沿着直径劈成两个半圆柱体，它的表面积将增加80平方分米．原圆柱体的表面积是多少．
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">3.14 * 40</gadget>
<output>125.6</output>

<gadget id="calculator">125.6 + 6.28</gadget>
<output>131.88</output>

<result>131.88</result>