A cylinder is expanded to form a square with a perimeter of 25.12 cm. What is the volume of this cylinder in cubic centimeters?
一个圆柱体侧面展开后是一个周长为25.12厘米的正方形，这个圆柱体的体积是多少立方厘米．
<gadget id="calculator">25.12 / 4</gadget>
<output>6.28</output>

<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>