cylindrical grain hoard has a base radius of 1.5 meters measured from the inside and a height of 4 meters. If each cubic meter of corn weighs about 750 kilograms, how many tons of corn can this grain store hold?
一个圆柱形粮囤，从里面量得底面半径是1.5米，高是4米．如果每立方米玉米约重750千克，这个粮囤能装多少吨玉米？
<gadget id="calculator">1.5 ** 2</gadget>
<output>2.25</output>

<gadget id="calculator">4 / 1_000</gadget>
<output>1/250 = around 0.004</output>

<gadget id="calculator">750 * 3.14 * 2.25 * (1/250)</gadget>
<output>21.195</output>

<result>21.195</result>