Khan Academy
Khan Academy: Classify Shapes by Line and Angle Types
Classify shapes based on pictures or attributes, such as angle types and side-lengths. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Practice: Classify Shapes by Line and Angle Types
Look at the properties of 2D shapes to see which shapes can belong to the same group. Includes hints.