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Prove theorems about lines and angles. Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment's endpoints.
Exercises from Illustrative Mathematics
A set of exercises, commentary, and solutions. For this unit, choose:
G-CO Points equidistant from two points in the plane
G-CO Congruent angles made by parallel lines and a transverse
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