A cylindrical oil drum has a bottom radius of 3dm and a height of 12dm. What is the volume of this oil drum in dm**3.
一个圆柱形油桶，底面半径是3dm，高12dm，这个油桶的体积是多少dm**3．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 12</gadget>
<output>339.12</output>

<result>339.12</result>