There is a rectangle with a length of 8 cm and a width of 5 cm. What is the volume of the resulting three-dimensional figure if it is rotated around its long axis?
有一个长8厘米，宽5厘米的长方形．如果以它的长为轴旋转一周，所得的立体图形的体积是多少？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 8</gadget>
<output>628</output>

<result>628</result>