4.1 Classifying Triangles . Name the 6 ways we classify triangles. Give at least 3 examples to show the different classifications. Exterior Angle Theorem : solve for x using exterior angle theorem: 5x + 12 . 4.2 Applying Congruence . 1. Two figures are congruent if they have the same _____ and _____. 2. An equilateral triangle is also a special isosceles triangle. It has at least two congruent sides. Triangles Scalene Isosceles Equilateral Use both the angle and side names when classifying a triangle. The chart below shows an example of each type of triangle when it is classified by its sides and angles. Scalene Isosceles Equilateral Acute 7 11

Side lengths and angle measures of similar figures (8-Q.7) 8.G.A.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. Find missing angles in triangles (8-O.7)

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