If the height of a cylinder decreases by 1 cm, its surface area decreases by 25.12 cm**2. If the height of this cylinder is 5 cm, what is its volume in cm**3.
一个圆柱体，高每减少1cm，它的表面积就减少25.12cm**2，如果这个圆柱体的高是5cm，那么它的体积是多少cm**3．
<gadget id="calculator">25.12 / 1 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 5</gadget>
<output>251.2</output>

<result>251.2</result>