1. Lesson 4-9: Isosceles and Equilateral Triangles
Rigor: Use and apply properties of isosceles and equilateral triangles
Relevance: Triangle properties are used in architecture, construction, and art.

2. Notes: Isosceles Triangles
Isosceles triangles have at least 2 ≅ sides.
Parts:
Isosceles Triangle Theorem – If 2 sides of a triangle are congruent, then the angles opposite them are congruent.

3. Notes: Isosceles Triangles continued
The converse is also true!
Isosceles Triangle Theorem Converse: If 2 angles of a triangle are congruent, then the opposite sides are also congruent.
We will prove both of these theorems later in the chapter using congruent triangles.

4. Equilateral Triangle Theorem
A triangle is equilateral if and only if it is equiangular.
AND

5. Examples: Applying the triangle theorems

6. Examples continued:
What is CB?

7. 4-9 Classwork (not graded)
Workbook page 181 #1 – 6
Be ready to discuss answers in 10 minutes

8. Primary Assignment: join.quizizz.com Codes:
4-9 Honors Assignments
Primary Assignment: join.quizizz.com
Codes:
Period 1 – (due Thursday)
Period 5 – (due Thursday)
Period (due Friday)
Secondary Assignment:
Workbook pg183 #3 – 10, pg184 ALL

9. 4-9 Standard Assignments
Primary Assignment: join.quizizz.com
Codes:
Period 2 – (due Friday)
Period 4 – (due Friday)
Period (due Thursday)
Secondary Assignment:
Workbook pg183 #3, 4, 6 – 10, pg184 ALL