The equation of the circle is may be expressed as, (x - h)² + (y - k)² = r² where h and k are the abscissa and ordinates of its center, respectively, and r is radius. Substituting the given values to the equation above, (x - 5)² + (y - 3)² = 4² Simplifying further the equation gives, x² + y² - 10x - 6y + 18
