how to find the center point of a circle
Circle with a center of (2, -1) and a radius of 4. Definition : A circle is the set of all points that are the same distance, r, from a fixed point. General Formula: X 2 + Y 2=r2 where r is the radius. Unlike parabolas, circles ALWAYS have X 2 and Y 2 terms. X2 + Y2=4 is a circle with a radius of 2 (since 4 =22)