Math 9: Exploring Chord Properties (Part 1 of 3)

Line Segment AB goes through the centre of the circle. Move point B along DE until AB is perpendicular to DE. What do you notice about the DB and BE?
The Rule: A line that passes through the centre of a circle and is perpendicular to a chord bisects that chord. The Big Picture: - perpendicular - bisector of chord - through centre of circle if two of these are true then all three are true.