There is a cylindrical wooden stake, cut along the diameter is a square, the circumference of the bottom of the cylinder is 6.28 cm, find the volume of the cylinder.
有一个圆柱形木桩，沿直径切开切面是一个正方形，圆柱底面周长是6.28厘米，求圆柱体体积．
<gadget id="calculator">6.28 / 3.14</gadget>
<output>2</output>

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

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

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<result>6.28</result>