conical pile of rubble has a diameter of 40 meters at the bottom and a height of 1.5 meters. What is the volume of the pile of rubble in cubic meters?
一个圆锥形碎石堆，底面直径40米，高1.5米，这个碎石堆的体积是多少立方米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">(1/3) * 3.14 * 400 * 1.5</gadget>
<output>628</output>

<result>628</result>