The general form of the equation for a circle whose center at (h, k ) and radius  is r : .

First to find the length of the radius (r). I assume that the coordinates given for the radius are the coordinates of the end-point of the radius.

Since the radius of a circle begins at the center of the circle.

Find the distance between the center (6, 6) and the end-point (-4, 3) using the distance formula: \ \

The equation of the circle is