Points C and D both lie on the circumference of the circle and have tangent lines passing through them. Point A is the point where the two tangent lines intersect away from the circle.[br][br]Move around points C and D and observe the change in the length of the line segments AC and AB. [br]Do you think that there is a relationship between the length of these line segments?[br]Mark the checkbox to confirm the relationship between the lengths of the line segments.[br][br]Can you prove it?