Putting together two identical cylinders into a large cylinder with a length of 10 cm, the surface area is reduced by 25.12 cm2. What is the volume of the original cylinder in cubic centimeters?
把两个完全一样的圆柱体拼成一个10厘米长的大圆柱体，表面积减少了25.12平方厘米，原来一个圆柱体的体积是多少立方厘米．
<gadget id="calculator">25.12 / 2</gadget>
<output>12.56</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">12.56 * 5</gadget>
<output>62.8</output>

<result>62.8</result>