Khan Academy Static

Triangle congruence is not only useful when working with triangles, it's also useful with any other kind of polygon! Prove a few theorems about the properties of parallelograms using triangle congruence.

4250_Proof_Rhombus_area.html

4246_Proof_Diagonals_of_a_parallelogram.html

4245_Proof_Opposite_sides_of_a_parallelogram.html

4248_Proof_The_diagonals_of_a_kite_are_perpendicular.html

4247_Proof_Opposite_angles_of_a_parallelogram.html

4249_Proof_Rhombus_diagonals_are_perpendicular_bisectors.html