Theorem 8.3 Class 9 If each pair of opposite sides of a quadrilateral is equal, then it is a parallelogram.Theorems Theorem 8.3 Class 9 If each pair of opposite sides of a quadrilateral is equal, then it is a parallelogram. Share this:Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)MoreClick to share on Pinterest (Opens in new window)Click to share on Telegram (Opens in new window) Related