cone-shaped sand pile is 3 meters high, and the circumference of the bottom surface is measured to be 18.84 meters. How many cubic meters is this pile of sand?
一个圆锥形沙堆高3米，量得底面周长18.84米．这堆沙有多少立方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</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>