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Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180?; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.Exercises from Illustrative MathematicsA set of exercises, commentary, and solutions. For this unit, choose:G-CO Midpoints of Triangle SidesG-CO Congruent angles in isosceles trianglesG-CO Sum of angles in a triangle
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