If a cylindrical wood is cut into two small cylinders, its surface area will increase by 6.28 square centimeters. If it is cut into two half cylinders along the diameter, its surface area will increase by 20 square centimeters. Find the surface area of the original cylindrical wood ．
一个圆柱形木料，如果截成两个小圆柱体，它的表面积增加6.28平方厘米，如果沿着直径截成两个半圆柱体，它的表面积将增加20平方厘米，求原来圆柱形木料的表面积．
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<gadget id="calculator">6.28 / 2 / 6.28 / 2</gadget>
<output>0.25</output>

<gadget id="calculator">0.25 * 0.25 * 2</gadget>
<output>0.125</output>

<gadget id="calculator">20 / 2 / 0.125</gadget>
<output>80</output>

<gadget id="calculator">3.14 * 0.125 * 80</gadget>
<output>31.4</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">31.4 + 6.28</gadget>
<output>37.68</output>

<result>37.68</result>