hekla re : Produit scalaire - Parallélogramme ABDC 03-05-16 à 16:47. Anglais: Parallelogram: A quadrilateral that contains two pairs of parallel sides. Diagonal AC of a parallelogram ABCD bisects ∠A (see figure). A D AC Diagonals AC and BD of a quadrilateral ABCD intersect each other at O such that OA : OC = 3: 2. Since the figure is a parallelogram BC// to AD and