What is the volume of the three-dimensional figure produced by rotating an isosceles right triangle with a side of 3 decimeters along one side for one revolution?
一个直角边为3分米的等腰直角三角形沿着一条直角边旋转一周所产生的立体图形的体积是多少立方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 3</gadget>
<output>28.26</output>

<result>28.26</result>