Give the Coordinates of the Circle's Center and Its Radius $$x ^ { 2 } + y ^ { 2 } - 1 = 0$$

Short Answer

Give the coordinates of the circle's center and its radius.​ $$x ^ { 2 } + y ^ { 2 } - 1 = 0$$ ​
Enter your answer using the coordinate notation: (a,b)and r = ....separated with a comma.