Properties of a parallelogram based on its diagonals.
A worksheet titled "Parallelogram worksheet" from Brighterly.com, showing a parallelogram ABCD with diagonals AC and BD intersecting at point O. The worksheet explains that diagonals bisect each other (AO ≅ OC, BO ≅ OD) and divide the parallelogram into two congruent triangles (△DAB ≅ △BCD, △ADC ≅ △CBA).