Math 9: Exploring Chord Properties (Part 2 of 3)

Line Segment AB bisects Chord DE. Move Point A so that AB goes through the centre of the circle. What do you notice about the angle?
The Rule: If a bisector of a chord in a circle passes through the centre, then the bisector is perpendicular to the chord. The Big Picture: - perpendicular - bisector of chord - through centre of circle if two of these are true then all three are true.