A conical pile of wheat has a base radius of 2 meters and a height of 1.5 meters. If each cubic meter of wheat weighs 0.75 tons, how many tons does this pile of wheat have?
一个圆锥形麦堆，底面半径是2米，高是1.5米．如果每立方米小麦重0.75吨，那么这堆小麦有多少吨？
<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 * 1.5</gadget>
<output>6.28</output>

<gadget id="calculator">0.75 * 6.28</gadget>
<output>4.71</output>

<result>4.71</result>