What shape is obtained by rotating a rectangular cardboard with a length of 3 decimeters and a width of 2 decimeters along its length? And calculate the volume of the resulting shape.
把一个长3分米，宽2分米的长方形硬纸沿长旋转一周，得到的是什么形体？并计算所得形体的体积．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 3</gadget>
<output>37.68</output>

<result>37.68</result>