The worker uncle saw a cylindrical wood with a height of 1 meter into two sections along the direction parallel to the ground. At this time, the surface area increased by 25.12 square decimeters compared with the original one. What is the radius of the bottom surface of this wood?
工人叔叔把一根高1米的圆柱形木料，沿于地面平行的方向锯成两段，这时表面积比原来增加了25.12平方分米，求这根木料的底面半径是多少？
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