There is a cuboid wood whose height is 30 centimeters and whose bottom is a square with side length 20 centimeters. If this wood is to be processed into the largest cylinder, what is the volume cut off in cubic centimeters?
有一个长方体木料，它的高是30厘米，底面是边长为20厘米的正方形，要把这块木料加工成一个最大的圆柱体，削去的体积是多少立方厘米？
<gadget id="calculator">20 * 20 * 30</gadget>
<output>12_000</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 30</gadget>
<output>9_420</output>

<gadget id="calculator">12_000 - 9_420</gadget>
<output>2_580</output>

<result>2_580</result>