Uncle worker divides a cylindrical wood with a height of 1 meter into two parts evenly along the diameter of the bottom surface. At this time, the surface area is increased by 0.8 square meters compared with the original one. Find the original volume of the wood.
工人叔叔把一根高1米的圆柱形木料，沿底面直径平均分成两部分，这时表面积比原来增加0.8平方米，求木料原来的体积．
<gadget id="calculator">0.8 / 2 / 1</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 / 1</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 ** 2</gadget>
<output>0.16</output>

<gadget id="calculator">3.14 * 0.16 * 1</gadget>
<output>0.5024</output>

<result>0.5024</result>