G.5.A
Investigate patterns to make conjectures about geometric relationships, including angles formed by parallel lines cut by a transversal, criteria required for triangle congruence, special segments of triangles, diagonals of quadrilaterals, interior and exterior angles of polygons, and special segments and angles of circles choosing from a variety of tools.
Khan Academy ResourcesGetting ready for transformation propertiesGetting ready for congruenceTriangle congruence postulates/criteriaWhy SSA isn't a congruence postulate/criterionCorresponding angles in congruent trianglesUsing similar & congruent trianglesProving the SAS triangle congruence criterion using transformationsProving the SSS triangle congruence criterion using transformationsProving the ASA and AAS triangle congruence criteria using transformations

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