After cutting a cylinder with a height of 10 cm into several equal parts and assembling it into an approximate cuboid, the surface area increases by 100 cm2. What is the volume of the cylinder in cubic centimeters?
把高10厘米的圆柱切成若干等份，拼成一个近似的长方体后，表面积增加了100平方厘米，这个圆柱的体积是多少立方厘米．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 10</gadget>
<output>785</output>

<result>785</result>