A conical sand pile has a base radius of 2 meters and a height of 15 decimeters. Each cubic meter of sand weighs 1.8 tons. How many tons does this pile of sand weigh?
一个圆锥形沙堆，底面半径2米，高15分米，每立方米沙重1.8吨，这堆沙重多少吨？
<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 * 1.5</gadget>
<output>6.28</output>

<gadget id="calculator">1.8 * 6.28</gadget>
<output>11.304</output>

<result>11.304</result>