2.5 Proofs in geometry

1. 2.5 Proofs in geometry

2. Agenda Turn in Projects!!! Quiz Warm-up HW Check 2.5 Notes Practice Homework

3. Warm-up

4. Homework Check 5. Reflexive 6. Distributive 7. Division 8. Symmetric 9. Multiplication 10. Reflex. 11. Subtract. 12. Symmetric 13. Substit. 14. Addition 15. Transitive 16. 15 17. 5x 18. YU=AB 19. <K 20.<PQR 21. 3 22. EF +7 27. Given, Defn of Midpt., Substitution, Subtraction, Division

5. Vertical Angles 2 1 3 4 2 1 3 4 • A pair of nonadjacent angles formed by two intersecting lines. • What can we say about vertical angles? • Vertical Angles are≅ • Indicate which angles are congruent

6. Are angles whose measures have a sum of

7. D C Are two angles whose measures have a sum of

8. Example: If m<1 = 3x+5 and m<3 = 5x -25, Find m<4 and m<GHD

9. Reasoning and Proof In Geometry **Things we CANNOT assume unless it is marked or stated.

12. Draw a conclusion based on the info given. -Justify Given: m<A = 90 Conclusion: Reason:

13. Conclusion: Reason:

14. 3. Given: R is the midpoint of ST. Conclusion: Reason: Given: W, U, and V are collinear and U is between W and V. Conclusion: Reason:

15. Homework Worksheet Mini-Project due Tuesday, Sept 18 Test Sept 18.