A pile of conical sand has a diameter of 10 meters at the bottom and a height of 3 meters. How many cubic meters is the pile of sand?
一堆圆锥形沙堆，底面直径是10米，高是3米，这堆沙子有多少立方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 3</gadget>
<output>78.5</output>

<result>78.5</result>