Cut a cuboid block with a square cross section into the largest cone. It is known that the circumference of the cone is 12.56 cm and the height is 5 cm. What is the volume of the cuboid?
把一个横截面为正方形的长方体木块，削成一个最大的圆锥体，已知圆锥的底面周长是12.56厘米，高5厘米，长方体的体积是多少？
<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

<gadget id="calculator">4 * 4 * 5</gadget>
<output>80</output>

<result>80</result>