Mathematics
Mathematics, 21.09.2019 02:30, cpratt2558

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
1. segment bd is an angle bisector of ∠abc. 1. by construction
2. ∠abd ≅ ∠cbd 2. definition of an angle bisector
3. segment bd ≅ segment bd 3. reflexive property
4. 4. side-angle-side (sas) postulate
5. ∠bac ≅ ∠bca 5. cpctc
which statement can be used to fill in the numbered blank space?
a. δdab ≅ δdbc
b. δabd ≅ δabc
c. δabc ≅ δcbd
d. δabd ≅ δcbd


Given: line segment ab≅line segment bc prove: the base angles of an isosceles triangle

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