a cylinder. If its height is shortened by 4 cm, the surface area is reduced by 50.24 cm2. How much does the volume decrease in cubic centimeters?
一个圆柱体．如果把它的高截短4厘米，表面积就减小50.24平方厘米．体积减小多少立方厘米．
<gadget id="calculator">50.24 / 4 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<result>50.24</result>