A cylinder is obtained by rotating a cube around one side of the cube. Find the volume of this cylinder. The side length is 4 cm.
以一个正方体的一条边为轴旋转一周，得到一个圆柱．求这个圆柱的体积．边长为4厘米．
<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>