Given: ABC is an isosceles triangle where AB = BC.
Prove: m

Question

Given:   ABC is an isosceles triangle where AB = BC.
Prove: m<BAC = m<BCA

http://contentlaunch.ple.platoweb.com/testimagedb/40/40846c3aca74ae3f025f80ede8564984

Proof:
Statement	Reason
1. Let   ABC be an isosceles triangle where AB = BC.	given
2. Create point D on   so that   bisects m<ABC as shown.	constructing an angle bisector
3. m<ABD = m<DBC	definition of angle bisector
4. BD = BD	 
5.   ABD=CBD	SAS
6. m<BAC = m<BCA	 
Corresponding angles of congruent triangles are equal.

anonymous · Answer

What is the reason for statement 4 in this proof?
A. Transitive Property of Equality
B. definition of midpoint
C. definition of parallel lines
D. Reflexive Property of Equality