To correctly identify the center of the circle we have to place the equation in the standard form. The center of this circle is located at 2 3 on the coordinate system and the radius is 4. The center-radius form of the circle equation is in the format x h 2 y k 2 r2 with the center being at the point h k and the radius being r.
To illustrate how the equation of a circle works lets graph the circle whose equation is.
Since the point of tangency is given thats the point to use. Let a be the radius of the circle which is equal to OP. To illustrate how the equation of a circle works lets graph the circle whose equation is. B Graph the circle.