A conical pile of sand has a base circumference of 25.12 meters and a height of 1.8 meters. Each cubic meter of sand weighs 2.5 tons. How many tons does this pile of sand weigh?
一堆圆锥形沙子，底面周长是25.12米，高1.8米，每立方米的沙子重2.5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">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">(1/3) * 3.14 * 16 * 1.8</gadget>
<output>30.144</output>

<gadget id="calculator">30.144 * 2.5</gadget>
<output>75.36</output>

<result>75.36</result>