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Khan Academy

Khan Academy: Classify Shapes by Line and Angle Types

For Students 3rd - 5th Standards
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.
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Khan Academy

Khan Academy: Practice: Classify Shapes by Line and Angle Types

For Students 4th
Look at the properties of 2D shapes to see which shapes can belong to the same group. Includes hints.