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Grouping Shapes by Parallel and Perpendicular Sides

Which shapes go together based on parallel and perpendicular lines?

Letters With Symmetry

Let’s group letters by their symmetry, then create symmetrical words, and then symmetrical sentences!

The Angles of a Triangle

Why tell a kid the rules of a triangle when they can discover them!?

Grouping Quadrilaterals In A Hierarchy

Can we classify quadrilaterals like we classify living things?