Khan Academy Static

Do the angles in a triangle always add up to the same thing? Would I ask it if they didn't? What do we know about the angles of a triangle if two of the sides are congruent (an isosceles triangle) or all three are congruent (an equilateral)? This tutorial is the place to find out. Common Core Standard: 8.G.A.5

1114_Triangle_angle_challenge_problem_2.html

1113_Triangle_angle_challenge_problem.html

1110_Triangle_angle_example.html

1109_Angles_in_a_triangle_sum_to_180_proof.html

1111_Worked_example_Triangle_angles_intersecting_lines_.html

1112_Worked_example_Triangle_angles_diagram_.html