If the circumference of the base of the cone is 6.28 decimeters and the height is 9 decimeters, what is the volume in cubic decimeters?
若圆锥的底面周长是6.28分米，高是9分米，体积是多少立方分米．
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">(1/3) * 3.14 * 1 * 9</gadget>
<output>9.42</output>

<result>9.42</result>