The side area of a cylinder is 25.12cm**2, the circumference of the bottom is 6.28cm, what is the volume of this cylinder in cm**3.
一个圆柱的侧面积是25.12cm**2，底面周长是6.28cm，这个圆柱的体积是多少cm**3．
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">25.12 / 6.28</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 1 * 4</gadget>
<output>12.56</output>

<result>12.56</result>