On the construction site, there is a sand that is approximately in the shape of a cone. The measured circumference of the bottom surface is 12.56 meters and the height is 1.5 meters. Each cubic meter of stone weighs about 2 tons. How many tons does this pile of sand weigh?
在建筑工地上有一个近似于圆锥形状的沙子，测得底面周长12.56米，高1.5米．每立方米石大约重2吨，这堆沙约重多少吨？
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 2 * 2 * 1.5 * (1/3)</gadget>
<output>6.28</output>

<result>6.28</result>