If a cube of 1 cubic decimeter is cut into the largest cylinder, what is the volume to be cut?
把一个1立方分米的正方体木料，削成一个最大的圆柱，要削去的体积是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) ** 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * (1/4) * 1</gadget>
<output>0.785</output>

<gadget id="calculator">1 - 0.785</gadget>
<output>0.215</output>

<result>0.215</result>