There is an approximately conical sand pile on the construction site, and its height is measured to be 1.5 meters. The diameter of the base is 4 meters. How many cubic meters is this pile of sand?
工地上有一个近似圆锥形的沙堆，量得它的高是1.5米．底面直径是4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">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">(1/3) * 3.14 * 4 * 1.5</gadget>
<output>6.28</output>

<result>6.28</result>