Question

Point O is the center of a circle passing through points A, B, and C. Which statement about ABC is true?

Answer 1

This started out to be an interesting, fun, and challenging question.

What I thought you were going to ask was "If I give you 3 points,
find the equation of the circle that goes through all 3 of them".
That can actually be solved.  I used to be able to do it, and when
your question started out, I began to salivate, and I started to look
forward to discovering whether I could still figure out how to do it.

But then your question fizzled out.  All you did was ask "Which statement
is true ?" ... and then not give any statements to choose from ! 
What kind of a question is that ? ! ?

What a disappointment.