What’s In My Brain: Pentagon vs Pentagon

We’re looking at regular vs irregular polygons.

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: University Ave

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?

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?

What’s In My Brain: Trapezoids or Not?

Which are trapezoids and which are not?

Same Perimeter, Different Area For Rectangles

Can two rectangles have the same perimeter but… different areas!?

Grouping Quadrilaterals In A Hierarchy

Can we classify quadrilaterals like we classify living things?

Deducing the Area of Triangles

Using patterns, students try to deduce where that area formula came from.