There is a cylinder whose base circumference is equal to its height. If the height is shortened by 2 cm, the surface area will be reduced by 62.8 cm2. What is the volume of this cylinder in cubic centimeters?
有一个圆柱体它的底面周长和高相等，如果高缩短2厘米，则表面积比原来减少62.8平方厘米．原来这个圆柱体的体积是多少立方厘米．
<gadget id="calculator">62.8 / 2</gadget>
<output>31.4</output>

<gadget id="calculator">31.4 / 2 / 3.14</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">78.5 * 31.4</gadget>
<output>2_464.9</output>

<result>2_464.9</result>