If the height of a cylinder is shortened by 4 cm, the surface area will be reduced by 50.24 cm2, and its volume should be reduced by how many cm3.
一个圆柱体，如果把它的高截短4厘米，表面积就减少50.24平方厘米，那么它的体积应减少多少立方厘米．
<gadget id="calculator">50.24 / 4</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 / 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>