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<p>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.</p><p>Exercises from Illustrative Mathematics<br/>A set of exercises, commentary, and solutions. For this unit, choose:</p><p>G-CO Midpoints of Triangle Sides<br/>G-CO Congruent angles in isosceles triangles<br/>G-CO Sum of angles in a triangle</p>
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