Next to the school’s sandpit, there is an approximately conical sand pile. The diameter of the bottom of the sand pile is 4 meters and the height is 0.9 meters. If each cubic meter of sand weighs about 1.5 tons, how many tons does this pile of sand weigh?
学校的沙坑旁边有一个近似圆锥形的沙堆，测得沙堆的底面直径是4米，高是0.9米，如果每立方米的沙约重1.5吨，这堆沙重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">(1/3) * 3.14 * 4 * 0.9 * 1.5</gadget>
<output>5.652</output>

<result>5.652</result>