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Grouping Shapes by Parallel and Perpendicular Sides

Which shapes go together based on parallel and perpendicular lines?

Geometry Image: Esplanade Theaters

What odd and interesting shapes can your students find in this geometric image?

Geometry Image: Victoria Conference Center

What odd and interesting shapes can your students find in this geometric image?

Lesson Makeovers: 3 Big Ideas

For Teachers

After looking at dozens of lessons folks sent in, I came up with three big ideas to address.

How Many Will There Be? Chip Off The Block

Give kids a taste of a sequence, let them build an understanding, and then see how far their predictions can take them.

Geometry Image: Skytree

What odd and interesting shapes can your students find in this geometric image?

Geometry Image: Steigerwald

What odd and interesting shapes can your students find in this geometric image?

Game: Order and Chaos

Imagine Tic-Tac-Toe if both players could play as both Xs and Os!