A cylinder, if its height is shortened by 2 meters, its surface area will be reduced by 62.8 square meters, and its volume will be reduced by how many cubic meters.
一个圆柱体，如果把它的高截短2米，表面积就减少62.8㎡，体积减少了它的多少立方米．
<gadget id="calculator">62.8 / 3.14 / 2 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">3.14 * 25 * 2</gadget>
<output>157</output>

<result>157</result>