A bamboo mat with a length of 12.56 meters and a width of 6.28 meters forms the largest cylinder. What is the volume of this cylinder in cubic meters?
把一张长12.56米，宽6.28米的竹席围成一个最大的圆柱体，这圆柱体的容积是多少立方米．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 6.28</gadget>
<output>78.8768</output>

<result>78.8768</result>