What additional information do you need to prove ∆ABC = ∆DEF by SAS?

1. A F E C B D What additional information do you need to prove ∆ABC = ∆DEF by SAS? BC = EF

2. J A R M Is JM an altitude, a median, both or neither? both (triangles are congruent by SSS)

3. J A R M Is JM an altitude, a median, both or neither? altitude

4. A F E C B D What additional information do you need to prove ∆ABC = ∆DEF by AAS? <C = <F

5. J O N L K M What additional information do you need to prove ∆JKL = ∆MNO by AAS? JL = MO OR KL = NO

6. J A R M Is JM an altitude, a median, both or neither? both (triangles are congruent by AAS)

7. J O N L K M What additional information do you need to prove ∆JKL = ∆MNO by AAA? Trick Question—∆s cannot be proven congruent by AAA!

8. J P N M A H HNP ASA ∆JAM = ∆_____ by _______?

9. J A B M JBM SAS ∆JAM = ∆_____ by _______? (reflexive prop)

10. J A R M Is JM an altitude, a median, both or neither? median

11. J A R M ∆JAM = ∆_____ by _______? NOT congruent!

12. D A J Y M ∆JAM = ∆_____ by _______? DAY ASA (all radii of a circle are congruent)

13. J A Z M JZM AAS ∆JAM = ∆_____ by _______? (reflexive prop)

14. A F E C B D What additional information do you need to prove ∆ABC = ∆DEF by ASA? <A = <D

15. J A R M Is JM an altitude, a median, both or neither? both

16. J A R M Is JM an altitude, a median, both or neither? median

17. J O N L K M What additional information do you need to prove ∆JKL = ∆MNO by ASA? JK = MN

18. J K M A D DKM AAS ∆JAM = ∆_____ by _______? (vertical angles)

19. J A R M Is JM an altitude, a median, both or neither? both (triangles are congruent by SAS)

20. The best thing you can do to prepare for the proof is to re-look at the proofs from this unit—especially the ones from the past 2 nights regarding altitude and median. If you would like to come in Friday morning, I will be at school around 6:30. See you then!