Circle Theorem 7 - Chords of a Circle
Perpendicular Line from Centre Bisects Chord
Perpendicular Line from Centre Bisects Chord By moving points A or B you can adjust the lenght of chord AB. D has been automatically set to the mid-point of AB. Note that the angles ODB and ODA are right angles. The converse is true: The perpendicular bisector of a chord will passthrough the centre of the circle.