Answer:
The distance between point A(-3,6) and another point is 10.
=> That point belongs to the circle with center A and radius 10.
=> The coordinate (x, y) of that point satisfies the equation of circle:
(x - -3)^2 + (y - 6)^2 = 10^2
or
(x + 3)^2 + (y - 6)^2 = 100
Hope this helps!