A conical wheat pile has a base radius of 2 meters and a height of 5 meters. Each cubic meter of wheat weighs about 900 kilograms. How many tons does this pile of wheat weigh?
一个圆锥形麦堆，底面半径是2米，高是5米，每立方米小麦约重900千克，这堆小麦大约有多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 5 * 900</gadget>
<output>18_840</output>

<result>18_840</result>