After the sides of the cylinder are unfolded, it becomes a square with a side length of 6.28 meters. What is the volume of this cylinder?
圆柱体的侧面展开后是一个边长为6.28米的正方形，这个圆柱体的体积为多少．
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 6.28</gadget>
<output>19.7192</output>

<result>19.7192</result>