US Common Core State Standard Math HSG-CO.C.9

Demonstrations 1 - 1 of 1

Description of Standard: 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*.