A cylindrical wood with a length of 20dm is now cut into 4 sections of equal length, and the surface area increases by 18.84dm**2. What is the surface area of the original cylindrical wood?
一根圆柱形木材长20dm，现截成长度相等的4段，表面积增加了18.84dm**2，原来圆柱形木材的表面积是多少？
<gadget id="calculator">18.84 / 6</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 / 3.14</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2 * 20</gadget>
<output>125.6</output>

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

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

<result>131.88</result>