Week 9

1
Week 9

• NOTE There is some carryover from week 8, so if
  you printed week 8, dont double print the slides

2
Draw and write down if the triangles are
congruent, and by what thrm\post
3
Proofs! The way I like to think about it to look
at all the angles and sides, and dont be fooled
by the picture.
A
D
C
B
E
Tips, label the diagram as you go along.
4
A
D
B
E
5
E
B
C
G
H
F
6
Use SSS Congruence Postulate to show that
(5, 4)
D
(1, 3)
E
(-5, 1)
A
(2, 2)
F
C
(-3, -2)
B
(-4, -3)
7
A
D
B
E
Tips, label the diagram as you go along.
8
(No Transcript)
9
A
C
B
D
E
10
B
A
C
E
D
11
4.5 Using Congruent Triangles
12
A
D
C
B
E
13
Some Ideas that may help you. If they want you to
prove something, and you see triangles in the
picture, proving triangles to be congruent may be
helpful. If they want parallel lines, look to use
parallel line theorems (CAP, AIAT, AEAT,
CIAT) Know definitions (Definition of midpoint,
definition of angle bisectors, etc.) Sometimes
you prove one pair of triangles are congruent,
and then use that info to prove another pair of
triangles are congruent.
14
A
D
B
E
15
(No Transcript)
16
B
A
C
E
D
17
N
A
E
L
G
18
You try this classic proof!
D
1
5
3
A
C
4
E
6
2
B