Line and angle proofs
Line and angle proofs is a free educational video by Khan Academy.It helps students in grades 9,10,11,12 practice the following standards HSG.CO.C.9.
1. HSG.CO.C.9 : 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..
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