A log with a length of 2 meters is cut into two small logs from the middle, and the surface area increases by 25.12 square centimeters. What is the original volume of the log?
一根长2米的圆木，从中间截成两段小圆木后，表面积增加了25.12平方厘米，这根圆木原来的体积是多少？
<gadget id="calculator">25.12 / 2</gadget>
<output>12.56</output>

<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">12.56 * 200</gadget>
<output>2_512</output>

<result>2_512</result>