If the circumference of a circle is 6.28 cm, what is the radius of the circle in cm?
如果圆的周长等于6.28厘米，那么这个圆的半径是多少厘米．
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<result>1</result>