If the base of a cylinder with a base radius of 2 decimeters is divided into several sectors on average, and after being cut and assembled into a cuboid with the same height as the base, the surface area increases by 16 decimeters, what is the volume of the cylinder?
将一底面半径为2分米的圆柱的底面平均分成若干个扇形，截开拼成一个和它等底等高的长方体后，表面积增加16平方分米，圆柱的体积是多少．
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">16 / 2 / 2</gadget>
<output>4</output>

<gadget id="calculator">6.28 * 2 * 4</gadget>
<output>50.24</output>

<result>50.24</result>