A rectangular piece of paper has a length of 10 cm and a width of 5 cm. What is the volume in cubic centimeters of the figure formed if it is rotated around the long side as the axis? (The result keeps π)
一张长方形纸片的长是10厘米，宽是5厘米．如果以长边为轴旋转一周，形成的图形的体积是多少立方厘米．(结果保留π)
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">25 * 10</gadget>
<output>250</output>

<result>250</result>