A conical pile of sand has a base diameter of 6 meters and a height of 2 meters. Each cubic meter of sand weighs 3 tons. How many tons does this pile of sand weigh?
一个圆锥形沙堆，底面直径6米，高2米．每立方米沙重3吨．这堆沙子重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 2 * 3</gadget>
<output>56.52</output>

<result>56.52</result>