A conical grain hoard has a base diameter of 2.5 meters measured from the inside and a height of 4 meters. If each cubic meter of corn weighs 750 kilograms, how many kilograms of corn can this grain store hold?
一个圆锥形粮囤，从里面量底面直径是2.5米，高4米．如果每立方米的玉米重750千克，这个粮囤能装多少千克玉米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2.5 / 2</gadget>
<output>1.25</output>

<gadget id="calculator">1.25 ** 2</gadget>
<output>1.5625</output>

<gadget id="calculator">(1/3) * 3.14 * 1.5625 * 4 * 750</gadget>
<output>4_906.25</output>

<result>4_906.25</result>