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.

3912_Proof_Rhombus_area.html

3907_Proof_Opposite_sides_of_a_parallelogram.html

3911_Proof_Rhombus_diagonals_are_perpendicular_bisectors.html

3908_Proof_Diagonals_of_a_parallelogram.html

3909_Proof_Opposite_angles_of_a_parallelogram.html

3910_Proof_The_diagonals_of_a_kite_are_perpendicular.html