If a cylinder with a base area of 12.56 square centimeters is cut into two cylinders of the same size, how much does the surface area increase?
把底面积是12.56平方厘米的圆柱，切成两个同样大小的圆柱，表面积增加多少．
<gadget id="calculator">12.56 * 2</gadget>
<output>25.12</output>

<result>25.12</result>