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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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CH 4.7 USE ISOSCELES AND EQUILATERAL TRIANGLES. In this section… We will use the facts that we know about isosceles and equilateral triangles to solve.

CH 4.7 USE ISOSCELES AND EQUILATERAL TRIANGLES. In this section… We will use the facts that we know about isosceles and equilateral triangles to solve.

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