Divide the bottom surface of a cylinder with a height of 4 decimeters into several sectors on average, then cut it open, and put it together to form an approximate cuboid with the same height as it. The surface area of the cuboid is 16 square decimeters larger than that of the cylinder. The volume of the original cylinder is How many?
把一个高4分米的圆柱体底面平均分成若干个扇形，然后切开，拼成一个与它等第等高的近似长方体，长方体的表面积比圆柱体增加16平方分米，原来圆柱的体积是多少？
<gadget id="calculator">16 / 2 / 4</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<result>50.24</result>