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Postulate 6
All straight angles are congruent.
Postulate 7
All right angles are congruent as they have the same measure.
Postulate 5
An angle has only one bisector
Postulate 3
A line segment can be bisected at only one point
Postulate 12
Vertical angles are congruent.
Bisector of a line segment
A ray, line, or line segment that intersects the line segment at its midpoint, dividing it into two congruent parts.
Note 
Flashcard (35)