A pile of sand is contained in a cylindrical container with a base radius of 2 meters and a height of 1.5 meters. If 1 cubic meter of sand weighs 1.6 tons. How many tons does this sand weigh?
一堆沙装在圆柱体容器中，量得底面半径2米，高1.5米．如果1立方米沙重1.6吨．这些沙重多少吨？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 1.5 * 1.6</gadget>
<output>30.144</output>

<result>30.144</result>