The circumference of the bottom surface of a conical grain pile is 18.84 meters, and the height is 9 meters. If there is no cubic decimeter and the weight of the grain is 780 kilograms, how heavy is the grain?
一个圆锥型谷堆的底面周长是18.84米，高9米，如果没立方分米谷重780千克这堆谷有多重？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 9</gadget>
<output>84.78</output>

<gadget id="calculator">84.78 * 780</gadget>
<output>66_128.4</output>

<result>66_128.4</result>