Given: line segment AB≅line segment BC
Prove: The base angles of an isosceles triangle are congruent.
The two-column proof with missing statement proves the base angles of an isosceles triangle are congruent.
Statement Reason
- segment BD is an angle bisector of ∠ABC. 1. by Construction
- ∠ABD ≅ ∠CBD 2. Definition of an Angle Bisector
- segment BD ≅ segment BD 3. Reflexive Property
- 4. Side-Angle-Side (SAS) Postulate
- ∠BAC ≅ ∠BCA 5. CPCTC
Which statement can be used to fill in the numbered blank space?
AΔDAB ≅ ΔDBC
BΔABD ≅ ΔABC
CΔABC ≅ ΔCBD
DΔABD ≅ ΔCBD
Prove: The base angles of an isosceles triangle are congruent.
The two-column proof with missing statement proves the base angles of an isosceles triangle are congruent.
Statement Reason
AΔDAB ≅ ΔDBC
BΔABD ≅ ΔABC
CΔABC ≅ ΔCBD
DΔABD ≅ ΔCBD