1. Unit 8 - Lesson 1 Angles in Triangles
Learning Goals:
I can solve for an interior angle on a triangle if given the other two interior angles.
The sum (or total) of the three interior angles of a triangle is 180o.

2. Unit 8 - Lesson 1 Angles in Triangles
Warm Up
How was your holidays?
What’s the schedule for the next 3 weeks?
- Practice EQAO on Friday (9)
- Real EQAO on Thursday (15) and Friday (16)
- Exams start Friday (23) EQAO and Exam Extra Time

3. Unit 8 - Lesson 1 Angles in Triangles
How many triangles do you know?
Let’s draw and name every type of triangle we know:

4. Unit 8 - Lesson 1 Angles in Triangles
Describe these triangles:

5. Unit 8 - Lesson 1 Angles in Triangles
Describe these triangles:

6. Unit 8 - Lesson 1 Angles in Triangles
Let’s have a closer look at the angles inside a triangle
The 3 angles inside a triangle are called the Interior Angles.
In this triangle,
∠A, ∠B, and ∠C
are the Interior Angles.

7. Unit 8 - Lesson 1 Angles in Triangles* *
Unit 8 - Lesson 1 Angles in Triangles
What did you notice about the SUM
of the Interior Angles on all the triangles?
They always add up to 180o.

8. Unit 8 - Lesson 1 Angles in Triangles
Determine the missing angle:

9. Unit 8 - Lesson 1 Angles in Triangles
Can this triangle really exist?

10. Unit 8 - Lesson 1 Angles in Triangles
Write a relationship for the measures of the angles:
Can we determine the measures of ∠a and ∠b

11. Unit 8 - Lesson 1 Angles in Triangles
Determine the measure of angles a, b, and c below:

12. Unit 8 - Lesson 1 Angles in Triangles
Learning Goals:
I can solve for an interior angle on a triangle if given the other two interior angles.
The sum (or total) of the three interior angles of a triangle is 180o.
Homework
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