The easiest way is to put it in polar mode then set r= to any constant. In rectangular mode, you can graph (sqrt(r^2-x^2)) and -(sqrt(r^2-x^2)) where r is any constant.
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When graphing inequalities you use a circle to indicate a value on a graph. If the value is included in the solution to the inequality you would fill in the circle. If the value that the circle represents is not included in the solution you would leave the circle unshaded.
When the value represented by the circle is part of the solution set.
If the inequality is > or< then it is an open circle. If it is greater than or equal to or less than or equal to, it is a closed circle.
Compasses make the job much easier!