A cylindrical learning tool is 5 cm high. After being cut and assembled into approximate cuboids, the surface area increases by 40 square centimeters. What is the volume of this cylindrical learning tool in cubic centimeters?
一个圆柱形的学具高5厘米，切拼成近似的长方体后，表面积增加了40平方厘米，这个圆柱型学具的体积是多少立方厘米．
<gadget id="calculator">40 / 2 / 5</gadget>
<output>4</output>

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

<gadget id="calculator">3.14 * 16 * 5</gadget>
<output>251.2</output>

<result>251.2</result>