The radius of the bottom surface of a conical grain pile is 4 meters, the height is 3 meters, and the weight of rice per cubic meter is 500 kilograms. How many kilograms does this pile of rice weigh?
一个圆锥形谷堆的底面半径是4米，高3米，每立方米稻谷重500千克，这堆稻谷重多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">(1/3) * 3.14 * 16 * 3 * 500</gadget>
<output>25_120</output>

<result>25_120</result>