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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 180 o.

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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 Unit 8 - Lesson 1 Angles in Triangles

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

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

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

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

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

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

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

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

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

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Homework Page 77 # 2 - 4, 7 - 10 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 180 o.

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