Khan Academy Static

The sum of the three interior angles of a triangle is always 180 degree. This property helps us solve a wide variety of problems based on Triangles.

8410_Triangle_angle_example.html

8409_Angles_in_a_triangle_sum_to_180_proof.html

8413_Triangle_angle_challenge_problem_2.html

8412_Worked_example_Triangle_angles_diagram_.html

8411_Worked_example_Triangle_angles_intersecting_lines_.html