Name: ____________________________________________ Period_________
Geometry Video Notes!
This worksheet is due at the end of the class period!!! All this stuff is what your homework will be over.
Make sure you use the examples in the book to help you with your homework. You could also log onto the
website and watch the videos again!!
VIDEO ONE – Chapter 4 Section 4
1. What are the 4 ways you can prove that triangles are congruent?
2. Once triangles are proved congruent, then you can conclude that _______________________________
____________________________________________________________________________________
____________________________________________________________________________________
3. Napoleon Proof:
Statements
1. EDF  EDG
2. DE  DE
3. DEG & DEF are right angles
4. DEG  DEF
5. DEG  DEF
6. EG  EF
Justifications
1.
2.
3.
4.
5.
6.
VIDEO TWO – Chapter 4 Section 5
4.
5. What is an isosceles triangle?
6. If two sides of a triangle are congruent, then ____________________________________________________
________________________________________________________________________________________
Name: ____________________________________________ Period_________
7. If two angles of a triangle are congruent, then ___________________________________________________
________________________________________________________________________________________
8. The bisector of the ________________________________ of an isosceles triangle is the
_____________________ of the base.
9. Given: WS  WV
WS is parallel to WV
Prove: RT  RS
Statements
1. WS  WV , WS is parallel to WV
2, WVS  S
3. WVS  R
4. S  R
5. RT  TS
Justifications
1. Given
2.
3.
4.
5.
END OF VIDEOS – PRACTICE PROBLEMS!!!
10. Write all the theorems, postulates, and corollaries from 4.4 and 4.5 in your notebooks!!
11.
Statements
Justifications
Name: ____________________________________________ Period_________
12.
Explain why each statement is true:
13. Find the value of y. (Look at the examples in your book if you need help!!)
14. Suppose the mL  43 in the diagram from #13. Find the value of y.
15. Given: AE  DE , AB  DC
Prove: EB  EC
Statements
Justifications