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Bellwork
• Do the following problem on a ½
sheet of paper and turn in.
The ratios of three angles in a
triangle are 8:6:4. Find the value of
x and classify the triangle by sides
and angles.
7.2 Two Proof
Oriented
Triangle
Theorems
Students will be able to
apply the AAS and No
Choice Theorems.
No Choice Theorem—
Toolbox!
• Prove: If two angles of one triangle are
congruent to two angles of another
triangle, then the third angles are
congruent.
• An Algebraic Proof:
Example 1
• Given: A  X
AVZ  XYB
ZVB  BYZ
• Prove: VBYZ is a parallelogram.
Example 2
• Given:
O is the center
SOV  TOW
WSO  VTO
• Prove: W  V
Homework
• pg. 304 #3, 4, 6, 9, 10, 14, 16
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
D
D
B
C
Skip
C
C
C
B
D
D
C
B
A
B
C
B
D
skip
skip
C
B
C
B
25.B
26.A
27.B
28.B
29.D
30.C
31.C
32.A
33.C
34.D
35.C (repeat)
36.B
37.A
38.A
39.B
40.C
41.D
42.C
43.A
44.C
45.C
46.A
47.C
48.A