The circumference of a cone is 28.26 decimeters and its height is 2 decimeters. What is its volume?
一个圆锥体的底面周长是28.26分米，高是2分米，它的体积是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">28.26 / 6.28</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 ** 2</gadget>
<output>20.25</output>

<gadget id="calculator">(1/3) * 3.14 * 20.25 * 2</gadget>
<output>42.39</output>

<result>42.39</result>