cylindrical piece of wood whose height is measured to be 80 cm, cut the wood vertically along the diameter of the bottom surface of the cylinder into two pieces, the surface area increases by 3200 square centimeters, what is the volume of each piece of wood after cutting.
一根圆柱形木料，测得它的高是80厘米，把该木材沿圆柱的底面直径垂直切开分成两块后，表面积增加3200平方厘米，切开后每块木材的体积是多少．
<gadget id="calculator">3_200 / 2 / 80</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">3.14 * 100 * 40</gadget>
<output>12_560</output>

<result>12_560</result>