A cylinder whose height is truncated by 3 meters reduces its surface area by 94.2 square meters. How much is the volume of the cylinder reduced in cubic meters?
一个圆柱，高截短3米，表面积减少94.2平方米．这个圆柱体积减少多少立方米．
<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>