Khan Academy Static

Topic C includes lessons 11-14 and covers definition of congruence and some basic properties, angles associated with parallel lines, angle sum of a triangle, and more on the angles of a triangle.

9360_Missing_angles_with_a_transversal.html

9357_Congruence_and_similarity_Harder_example.html

9359_Parallel_perpendicular_lines.html

9356_Congruence_and_similarity_Basic_example.html

9362_Angles_in_a_triangle_sum_to_180_proof.html

9361_Measures_of_angles_formed_by_a_transversal.html

9358_Angles_parallel_lines_transversals.html

9365_Worked_example_Triangle_angles_diagram_.html

9366_Triangle_angle_challenge_problem.html

9363_Triangle_angle_example.html

9364_Worked_example_Triangle_angles_intersecting_lines_.html

9367_Triangle_angle_challenge_problem_2.html