Answers (1)
You need to work on presentation so you can ask a clear question. Some equations have a standard form, but a circle is almost always expressed in the form (x - j)^2 + (y - k)^2 = r^2 when the circle is centered at (j, k).
You have not identified what (0, 1/2) is. You can not mumble or make spelling mistakes or leave anything to guess at in math. Your presentation must have exactly one possible interpretation. A math program will not tell you that you made a mistake, it will just give you goofy results.