This video explains that a triangle is a polygon with 3 sides. Triangles can be named, or classified, by the types of angles they have (acute, right, obtuse), or by the lengths of their sides (equilateral, isosceles, scalene). The video also explains how triangles can have more than one name (like an acute isosceles triangle). Click this link for lesson materials that go along with the video: https://www.teacherspayteachers.com/Product/Symmetry-Interactive-Lesson-for-Google-Classroom-6808922?utm_source=YouTube&utm_campaign=digital%20triangles
