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Reflexive Property: AB BA

9 Most Common Properties, Definitions & Theorems for Triangles 1. Reflexive Property: AB = BA When the triangles have an angle or side in common 6. Definition of a Midpoint Results in two segments being congruent 2. Vertical Angles are Congruent When two lines are intersecting 7. Definition of an angle bisector Results in two angles being congruent 3. Right Angles are Congruent When you are given right triangles and/or a square/ rectangle 8. Definition of a perpendicular bisector Results in 2 congruent segments and right angles.

Definition of a perpendicular bisector Results in 2 congruent segments and right angles. 4. Alternate Interior Angles of Parallel Lines are congruent When the givens inform you that two lines are parallel ≅ 9. 3rd angle theorem If 2 angles of a triangle are ≅ to 2 angles of another triangle, then the 3rd angles are 5. Definition of a ...

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