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**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.

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**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

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**Unit 8 - Lesson 1 Angles in Triangles**

How many triangles do you know? Let’s draw and name every type of triangle we know:

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**Unit 8 - Lesson 1 Angles in Triangles**

Describe these triangles:

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**Unit 8 - Lesson 1 Angles in Triangles**

Describe these triangles:

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**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.

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**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.

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**Unit 8 - Lesson 1 Angles in Triangles**

Determine the missing angle:

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**Unit 8 - Lesson 1 Angles in Triangles**

Can this triangle really exist?

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**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

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**Unit 8 - Lesson 1 Angles in Triangles**

Determine the measure of angles a, b, and c below:

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**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 Page 77 # 2 - 4,

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I can use theorems, postulates and/or definitions to prove theorems about triangles including: measures of interior angles of a triangle sum to 180 degrees.

I can use theorems, postulates and/or definitions to prove theorems about triangles including: measures of interior angles of a triangle sum to 180 degrees.

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