A master carpenter cuts a cuboid wood with a square cross section into the largest cylinder. The circumference of the bottom of this cylinder is 25.12 cm and the height is 40 cm. What is the volume of the original cuboid wood?
木匠师傅把一个横截面为正方形的长方体木料，削成一个最大的圆柱体，这个圆柱体的底面周长为25.12厘米，高40厘米，原来长方体木料的体积是多少？
<gadget id="calculator">25.12 / 3.14</gadget>
<output>8</output>

<gadget id="calculator">8 * 8 * 40</gadget>
<output>2_560</output>

<result>2_560</result>