Grandpa Wang’s house has a cone-shaped corn pile. The measured circumference of the bottom is 6.28 meters and the height is 1.2 meters. The corn weighs about 640 kilograms per cubic meter. How many kilograms does this pile of corn weigh?
王爷爷家有一个圆锥形的玉米堆，测得底面周长是6.28米，高是1.2米，每立方米玉米约重640千克，这堆玉米约重多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">(1/3) * 3.14 * 1 * 1.2 * 640</gadget>
<output>803.84</output>

<result>803.84</result>