how to prove that any connected 2 circles by 1 point have a straight line between centers through connection point
How to prove that the line xy is straight line or the angle between the lines x and y is 180 degrees?
I got answers assuming the 2 circle should intersect in 2 point.
my question is the 2 circles are connected in 1 point only
so assuming there will be triangle then the pic will look like this
ac & ad are the radius of the small circle
bc & be are the radius of the big circle
how to prove that ab is a straight line, in another way other than the perpendicular tangent way