If a cylinder with a base area of 6.28 cubic centimeters is cut into two cylinders, what is the increase in the surface area in square centimeters?
把一个底面积为6.28立方厘米的圆柱，切成两个圆柱，表面积增加多少平方厘米．
<gadget id="calculator">6.28 * 2</gadget>
<output>12.56</output>

<result>12.56</result>