If the height of a cylinder is reduced by 3 centimeters, the surface area will be reduced by 94.2 square centimeters, so how many cubic centimeters will its volume be reduced?
一个圆柱体，如果把高减少3厘米，表面积就减少94.2平方厘米，那么它减少的体积是多少立方厘米．
<gadget id="calculator">94.2 / 3</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 * 3</gadget>
<output>235.5</output>

<result>235.5</result>