### 2017-1-5 similar triangles AA postulate .notebook

```2017­1­5 similar triangles AA postulate .notebook
Today is Tues
1/5
Do Now:
­Take out HW and grade sheet
­Take calc
­Copy down HW AA Postulate W.S.
January 05, 2017
2017­1­5 similar triangles AA postulate .notebook
what is the value of x?
Today's Objective: Similar
Triangles (AA Postulate)
January 05, 2017
2017­1­5 similar triangles AA postulate .notebook
January 05, 2017
Method #2: AA Similarity Postulate
Two triangles with two pairs of equal angles are similar
How come we only have to show that two
angles are congruent? Why not all?
65
65
45
~
45
2017­1­5 similar triangles AA postulate .notebook
Is ΔABC ~ ΔA'B'C'?
Write an informal proof
Is ΔABC ~ ΔA'B'C'?
January 05, 2017
2017­1­5 similar triangles AA postulate .notebook
January 05, 2017
Is ΔABC ~ ΔA'B'C'?
Are the triangles similar?
Remember CORRESPONDING angles are
congruent
A
2017­1­5 similar triangles AA postulate .notebook
January 05, 2017
Find missing angle measures if
ΔABC ~ ΔDER
D
A
80
50
B
C
E
x
Given:
Find x
46
74
x
R
ABC ~