conical sand pile has a base circumference of 25.12 meters and a height of 2.1 meters. If each cubic meter of sand weighs 1.5 tons, how many tons is this pile of sand in total?
一个圆锥形沙堆，量的底面周长是25.12米，高是2.1米．若每立方米砂重1.5吨，这堆沙共多少吨？
<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 * 2 * 1.5</gadget>
<output>50.24</output>

<result>50.24</result>