Put two identical cylinders together, the height is 1 decimeter, and the surface area is reduced by 25.12 square centimeters, what is the volume of the original cylinder?
把两个完全相同的圆柱拼在一起，高是1分米，表面积减少25.12平方厘米，原来一个柱体的体积是多少．
<gadget id="calculator">25.12 / 2</gadget>
<output>12.56</output>

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

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

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

<result>62.8</result>