Optional question: Cutting a cylinder with a height of 8 decimeters into an approximate cuboid, the surface area is increased by 48 decimeters square, what is the original volume of the cylinder?
选做题：把一个高为8分米的圆柱割拼成一个近似长方体，表面积增加了48平方分米，原来圆柱的体积是多少？
<gadget id="calculator">48 / 2 / 8</gadget>
<output>3</output>

<gadget id="calculator">3 * 3 * 3.14 * 8</gadget>
<output>226.08</output>

<result>226.08</result>