Cut a section of cylindrical wood with a length of 6 decimeters along the diameter of the bottom surface, and the surface area increases by 2400 square centimeters. What is the lateral area of the original piece of wood in square centimeters?
把一段6分米长的圆柱形木料，沿着底面直径剖开，表面积增加了2400平方厘米，原来这段木料的侧面积是多少平方厘米．
<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">2_400 / 2 / 60</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20 * 60</gadget>
<output>3_768</output>

<result>3_768</result>