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Lesson 1: 4.1/4.2
Lesson 2: 4.3
Lesson 3: 4.4/4.5
Lesson 4: 4.4/4.5
Lesson 5: 4.7
Lesson 6: 4.6
Lesson 7: 4.8
Lesson 8: Review
Warm Up
USING A RULER, draw a triangle that fills the
space in your notes.
Pass your triangle to a partner.
Measure the angles in the triangle.
What do you notice?
Triangle Sum Conjecture
The sum of the measures of the angles in
every triangle ________________________. equals 180°
In this lesson we will answer…
How are the measures of the angles in a
triangle related?
Using the Triangle Sum Conjecture
Using the Triangle Sum Conjecture
Using the Triangle Sum Conjecture
Angles of a Triangle
Use the Triangle Sum Conjecture and your
algebra skills to solve for x.
Angles of a Triangle
Angles of a Triangle
Angles of a Triangle
Angles of a Triangle
In this lesson we will answer…
Do I remember the parts of an isosceles
triangle?
Is there anything special about the angles of
an isosceles triangle?
What can I assume to be true of any
isosceles triangle?
Parts of the Isosceles Triangle
Using the triangle provided:
Measure AB and BC.
What is true of these sides?
Fold triangle ABC to compare A and C.
What is true of A and C?
Check with your partners!
Vertex Angle
Base
Base Angle Base Angle
Leg Leg
DEF: An isosceles triangle has at least 2 congruent sides
Parts of the Isosceles Triangle
Isosceles Triangle Conjecture
If a triangle is isosceles, then
_______________________________.
Converse of the Isosceles Triangle Conjecture
If a triangle has ____________________
then it is __________________________.
the base angles are congruent
congruent base angles
isosceles
Examples
Examples
Examples
What STUCK with You?
Complete the Ticket Out the Door.
Explain how you arrived at each answer.
Almost Finished…
Clear Your Calculator and Turn It Off
2nd + 7 1 2 then 2nd On
Take out your agenda – copy down due dates
Quizzes
Tests
Homework
Practice 4.1 and 4.2
Do NOT pack up until you are told to do so!