Can you show me how to prove that the perpendicular bisector of a chord goes through the origin, or from another perspective, that if a line bisects a chord and goes through the origin it is perpendicular to the chord. I have looked for examples on the internet that describe how to do this but they all use something called the perpendicular bisector theorem. I have not covered this yet in my book. This is just the beginning of a basic geometry section.
I saw this example here
and i understood it up to this line m (angle) CMA
I don't know what the notation with the little m means. I also don't know the rule used in this angle that 2 angles that are supplementary and complementary must both be 90 degrees.
I guess the problem is explaining it using proofs that I have covered and y ou don't know what I do and don't know yet!