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Exploring Angles in a Triangles Chapter 8 Lesson 4 Image Taken from: http://www.mrhammond.org/math/mathlessons

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Classifying by Angle Acute triangles have three acute angles. Obtuse triangles have one obtuse angle. Right triangles have one right angle.

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Classifying by Sides Equilateral triangles have three congruent sides. Isosceles triangles have two congruent sides. Scalene triangles have zero congruent sides.

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Finding Missing Angles The three angles of a triangle always add to 180°. Use a variable to stand for the missing angle and set an equation equal to 180. x + 49 + 47 = 180 x + 96 = 180 – 96 = -96 x = 84

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Questions?

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