If the height of a cylinder is shortened by 2 centimeters, the surface area will be reduced by 62.8 square centimeters, and by how many cubic centimeters will its volume be reduced?
一个圆柱如果把它的高截短2厘米，表面积就减小62.8平方厘米，那么它的体积减小多少立方厘米？
<gadget id="calculator">62.8 / 2</gadget>
<output>31.4</output>

<gadget id="calculator">31.4 / 3.14 / 2</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 * 2</gadget>
<output>157</output>

<result>157</result>