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The Exterior Angles of a Triangle

The Exterior Angles of a Triangle. Objective: Students will solve problems that involve an exterior angle of a triangle. Note: An exterior angle of a triangle is equivalent to the sum of its two non-adjacent interior angles. . Example #1: Find x. x. 120 . 40. Example #2: Find x. 5x.

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The Exterior Angles of a Triangle

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  1. The Exterior Angles of a Triangle Objective: Students will solve problems that involve an exterior angle of a triangle.

  2. Note: An exterior angle of a triangle is equivalent to the sum of its two non-adjacent interior angles.

  3. Example #1: Find x. x 120 40

  4. Example #2: Find x. 5x 2(4x – 30) x + 20

  5. Example #3: Find x, then find the measure of the interior angles at A and B. 4x + 10 3x – 20 A 5(x – 14) B mA= 3(25) – 20 = 55 mB= 5(25 – 14) = 55

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