1. Week 5
Warm Up
Add theorem 2.1 here next year.

2. Find the scale factor of
Re 1
Find the scale factor of
Δ NQP to Δ TQR
scale factor =

3. I will identify similar Triangles. Angle – Angle (AA) Similarity
Section 8.4 Day 1
I will identify similar Triangles.
Postulate 25
Angle – Angle (AA) Similarity
If two angles of one triangle are congruent to
two angles of another triangle,
then the two triangles are congruent.

4. Ex 1 c.
b. ∠B ≅ ∠TEC
79 ⁰ ≅ ∠TEC
BE = BT - ET
BE =
BE = 15

5. Ex 2
Find the value of x. =
3( 17 ) = 4( 17 - x )
51 = x
-17 = -4x
4.24 = x

6. Ex 3
Don’t Write
rise
run

7. Can the triangles be proven similar?
Ex 4
m∠B = m∠E
m∠D =
47⁰
m∠C =
31⁰
m∠D ≠ m∠A
m∠C ≠ m∠F
Not similar – at least two angles must be congruent.

8. Do 1:
Assignment:
Handout - 8.4B