Geometry › Alternate exterior angles

Teacher info
Congruent angles OUTSIDE parallel lines
CCSS.MATH.CONTENT.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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https://schoolyourself.org/page/lti/sy/geometry/alternate-exterior-angles
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