The length of the rectangle is 8 cm and the length is twice the width. If the rectangle is rotated once with the length as the axis, please calculate the volume of the object obtained after the rotation?
长方形的长是8厘米，长是宽的2倍．如果以长为轴，把这个长方形旋转一周，请算一算旋转后得到的物体的体积是多少？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 4</gadget>
<output>200.96</output>

<result>200.96</result>