Two identical cylinders can be assembled into a cylinder with a length of 12 centimeters, but the surface area is reduced by 25.12 square centimeters. What is the volume of a cylinder in cubic centimeters?
两个完全相同的圆柱能拼成一个长12厘米的圆柱，但表面积比原来减少了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">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">12.56 * 6</gadget>
<output>75.36</output>

<result>75.36</result>