If a cylinder with a base area of 6.28 square centimeters is cut into two cylinders of the same size, how much will the surface area increase?
一个圆柱体的底面积是6.28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">6.28 * 2</gadget>
<output>12.56</output>

<result>12.56</result>