A cylindrical steel, after cutting off a section 10 cm long, the surface area is reduced by 314 square centimeters, and the volume is reduced by how many cubic centimeters.
一个圆柱形钢材，截去10厘米长的一段后，表面积减少了314平方厘米，体积减少了多少立方厘米．
<gadget id="calculator">314 / 10 / 3.14 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">3.14 * 25 * 10</gadget>
<output>785</output>

<result>785</result>