Divide a cylinder with a height of 4 cm into many equal sectors along the bottom surface, cut it and assemble it into a similar cuboid, the surface area increases by 16 cm**2 What is the volume of the cylinder in cm**3.
把一个高为4厘米的圆柱沿底面分成许多相等的扇形，切开后拼成近似的长方体，表面积增加了16cm**2圆柱的体积是多少cm**3．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">3.14 / 2</gadget>
<output>1.57</output>

<gadget id="calculator">4 * 1.57</gadget>
<output>6.28</output>

<gadget id="calculator">8 * 6.28</gadget>
<output>50.24</output>

<result>50.24</result>