A cuboid wood with a length of 4 cm, a width of 4 cm and a height of 5 cm is cut into the largest cylinder, and the volume of the cut cylinder is calculated.
一个长4厘米、宽4厘米、高5厘米的长方体木料，削成一个最大的圆柱，求削成的圆柱的体积．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">3.14 * (25/4) * 4</gadget>
<output>78.5</output>

<result>78.5</result>