Question: in abc shown below is congruent to given ...
Question details
In ΔABC shown below, is congruent to :
Given: ≅
Prove: The base angles of an isosceles triangle are congruent.
The twocolumn proof with missing statement proves the base angles of an isosceles triangle are congruent:
Statement  Reason 

1. is an angle bisector of ∠ ABC.  1. by Construction 
2.  2. Definition of an Angle Bisector 
3. ≅  3. Reflexive Property 
4. ΔABD ≅ ΔCBD  4. SideAngleSide (SAS) Postulate 
5. ∠ BAC ≅ ∠ BCA  5. CPCTC 
Which statement can be used to fill in the numbered blank space? (4 points)
∠ DBA ≅ ∠ CDB 

∠ CAB ≅ ∠ ACB 

∠ ABD ≅ ∠ CBD 

∠ BDA ≅ ∠ BDC 