Theorem: If two arcs of a circle or of congruent circles are congruent, then the corresponding chords are equal. Theorem: (Converse of Theorem): If two chords of a circle or of congruent circles are equal, then corresponding arcs are congruent. Theorem: The perpendicular from the centre of a circle to a chord bisects the chord. https://www.expertsmind.com/course-help/?p=correlation-and-regression-98734287136