Here's a great set of flash cards or matching game cards to help you reinforce your lesson on parallel, intersecting, and perpendicular lines!
There are two ways that these cards can be used:
1. Fold them over and make flashcards
2. Cut them out individually, paste them on some colorful construction paper, and laminate them to create cards for a matching game or center!
I have also given two different styles for the types on the perpendicular flash cards. Pick which one suits your needs the best!