A conical sand pile has a bottom circumference of 15.7 meters and a height of 1.5 meters. If the mass of sand per cubic meter is about 700 kg, what is the approximate mass of this pile of sand?
一个圆锥形沙堆底面周长15.7米，高1.5米．如果每立方米沙子的质量约是700千克，这堆沙子的质量约为多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15.7 / 3.14 / 2</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 ** 2</gadget>
<output>6.25</output>

<gadget id="calculator">(1/3) * 3.14 * 6.25 * 1.5 * 700</gadget>
<output>6_868.75</output>

<result>6_868.75</result>