Divide the bottom surface of a cylinder with a side area of 251.2 square centimeters into several sectors on average, cut it and assemble it into a cuboid with the same height as the bottom of the cylinder, how many square centimeters will the surface area increase from the original.
把一个侧面积为251.2平方厘米的圆柱体底面，平均分成若干个扇形，切开拼成与圆柱等底等高的长方体，表面积比原来增加了多少平方厘米．
<gadget id="calculator">251.2 / 3.14</gadget>
<output>80</output>

<result>80</result>