cone of wheat has a base radius of 2 meters and a height of 3 meters. Each cubic meter of wheat weighs about 0.8 tons. How many tons does this pile of wheat weigh?
一个圆锥体的小麦堆，底面半径2米，高3米．每立方米小麦约重0.8吨，这堆小麦共重多少吨？
<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 * 3</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 * 0.8</gadget>
<output>10.048</output>

<result>10.048</result>