Given:
AC bisects <BAD and <BCD
Prove:
<D=<B
Statement Reason
------------------------------------------------------------------------
AC bisects <BAD and <BCD | Given
m<DAC=m<BAC | Definition of an angle bisector
m<CAD=m<CAB | Definition of an angle bisector
AC=CA | Reflexive Property of Congruence
△ACD=△ACB | ASA
m<D=m<B | CPCTC