If the height of the cylinder is reduced by 1 cm, its surface area is reduced by 25.12 square centimeters. What is the diameter of the base of the cylinder in centimeters?
如果圆柱的高减少1厘米，它的表面积就减少25.12平方厘米，这个圆柱的底面直径是多少厘米？
<gadget id="calculator">25.12 / 1 / 3.14</gadget>
<output>8</output>

<result>8</result>