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Converse Angle Bisector Theorem

Rule

Converse Angle Bisector Theorem

If the ratio between ADAD and ABAB is equal to the ratio between CDCD and CB,CB, ADAB=CDCB, \frac{AD}{AB} = \frac{CD}{CB}, the segment mm is an angle bisector. The theorem is named the Converse Angle Bisector Theorem because the same thing holds true but in opposite order.