A cylindrical piece of wood with a height of 20dm, if cut into two parts along the diameter of the bottom surface, the surface area will be increased by 80dm**2 compared to the original one, find the surface area of this piece of wood.
一根圆柱形木料，高20dm，如果沿底面直径切成两部分，这时表面积比原来增加了80dm**2，求这根木料的表面积．
<gadget id="calculator">80 / 2 / 20</gadget>
<output>2</output>

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

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

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

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

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

<result>131.88</result>