A conical sand pile has a base diameter of 8 meters and a height of 1.8 meters. What is its approximate volume in cubic meters?
一个圆锥形沙堆，底面直径是8米，高是1.8米．它的体积大约是多少立方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">(1/3) * 3.14 * 16 * 1.8</gadget>
<output>30.144</output>

<result>30.144</result>