How many cubic decimeters of wood need to be cut to cut a cube with a side length of 20 cm into the largest cylinder?
把一个棱长是20厘米的正方体木块削成一个最大的圆柱，需要削去多少立方分米的木块．
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

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

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

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

<gadget id="calculator">8 - 6.28</gadget>
<output>1.72</output>

<result>1.72</result>