To cut a cylindrical wood with a bottom radius of 3 decimeters and a height of 6 decimeters into a largest cone, how much wood should be cut at least?
将一个底面半径是3分米，高是6分米的圆柱木料削成一个最大的圆锥，至少要削去多少木料？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3.14 * 9 * 6 * (2/3)</gadget>
<output>113.04</output>

<result>113.04</result>