conical pile of coal has a base radius of 1 meter and a height of 1.5 meters. If each cubic meter of coal weighs 1.4 tons, how many kilograms does this pile of coal weigh?
一堆圆锥形的煤，底面半径是1米，高1.5米，如果每立方米的煤重1.4吨，这堆煤有多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">(1/3) * 3.14 * 1 * 1.5 * 1.4 * 1_000</gadget>
<output>2_198</output>

<result>2_198</result>