If a cylinder with a bottom radius of 2dm and a height of 3dm is cut into the largest cone, how much dm should be cut off**3.
把一个底面半径是2dm，高是3dm的圆柱削成一个最大的圆锥，要削去多少dm**3．
<gadget id="calculator">2 ** 2</gadget>
<output>4</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 * 4 * 3 * (2/3)</gadget>
<output>25.12</output>

<result>25.12</result>