There is a cylindrical body with a height of 6.28 decimeters. Its lateral expansion is exactly a square. Find the volume of this body.
有一个高为6.28分米的圆柱体机件，它的侧面展开正好是一个正方形，求这个机件的体积．
<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>