cone-shaped sand pile is 3 meters high and the bottom radius is 5 meters. If each cubic meter of sand weighs about 1.7 tons. How many tons does this pile of sand weigh?
一个圆锥形的沙堆，高是3米，底面半径是5米，如果每立方米的沙约重1.7吨．这堆沙约重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 3</gadget>
<output>78.5</output>

<gadget id="calculator">78.5 * 1.7</gadget>
<output>133.45</output>

<result>133.45</result>