Triangles can come in many shapes and sizes but they all have two things in common: three sides and three angles. Thankfully Rosita was able to teach Grover all about triangles. Subscribe to the Sesame Street Channel here: http://www.youtube.com/subscription_center?add_user=SesameStreet For more fun games and videos for your preschooler in a safe, child-friendly environment, visit us at http://www.sesamestreet.org Sesame Street is a production of Sesame Workshop, a nonprofit educational organization. The Workshop produces Sesame Street programs, seen in over 150 countries, and other acclaimed shows, including The Electric Company. Beyond television, the Workshop produces content for multiple media platforms on a wide range of issues including literacy and numeracy, emotional wellbeing, health and wellness, and respect and understanding. Learn more at http://www.sesamestreet.org.