Lessons Fulfilling NCTM Standard 3a
Analyze characteristics and properties of two and threedimensional geometric shapes and develop mathematical arguments about geometric relationships

2D and 3D Shapes
14 videos by 4 teachers 
Angles
38 videos by 5 teachers 
Length and Perimeter
16 videos by 4 teachers 
NonEuclidean Geometry
1 video by 1 teacher 
Transformations
2 videos by 1 teacher 
Triangles
15 videos by 3 teachers 
Trig Functions
1 video by 1 teacher 
Unit Circle
5 videos by 3 teachers