“I live and die by your website!” ~ a coordinator in Washington

← Math

Geometry


How to Filter

Printable List

Letters With Symmetry

Letters With Symmetry

Let’s group letters by their symmetry, then create symmetrical words, and then symmetrical sentences!
Same Perimeter, Different Area For Rectangles

Same Perimeter, Different Area For Rectangles

Can two rectangles have the same perimeter but… different areas!?
Geometry Image: University Ave

Geometry Image: University Ave

What odd and interesting shapes can your students find in this geometric image?
An Olympic Sized Pool and Lots of Pasta (Episode 2)

An Olympic Sized Pool and Lots of Pasta (Episode 2)

How many pounds of pasta could you cook using the water in an olympic-sized pool?
Geometry Image: Victoria Conference Center

Geometry Image: Victoria Conference Center

What odd and interesting shapes can your students find in this geometric image?
What’s In My Brain: H vs Arrow

What’s In My Brain: H vs Arrow

Two columns. One is an example, one isn’t. Can you figure out the hidden rule before the big reveal?
The Angles of a Triangle

The Angles of a Triangle

Why tell a kid the rules of a triangle when they can discover them!?
Grouping Quadrilaterals In A Hierarchy

Grouping Quadrilaterals In A Hierarchy

Can we classify quadrilaterals like we classify living things?
Special Gifts with Special Requirements

Special Gifts with Special Requirements

Your special friends sure have some unique gift needs!
Discovering Pi With Sticky Notes

Discovering Pi With Sticky Notes

Pi is mysterious and strange! Why not let students discover it on their own?
Lines, Line Segments, Rays, and Infinity!

Lines, Line Segments, Rays, and Infinity!

A lesson about lines, line segments, and rays that avoids dull memorization. Instead, we ponder this delightful question: Which is longer, a ray or a line? Then, kids consider what these different geometric concepts would think about each other.
Fractals: Sierpinski’s Triangle

Fractals: Sierpinski’s Triangle

What if this triangle pattern just kept repeating… forever!?
An Olympic Sized Pool and 2 Liter Bottles (Episode 1)

An Olympic Sized Pool and 2 Liter Bottles (Episode 1)

How many 2 liter bottles could you fill up using the water in an olympic-sized pool?
What’s In My Brain: Trapezoids or Not?

What’s In My Brain: Trapezoids or Not?

Which are trapezoids and which are not?
Geometry Image: Steigerwald

Geometry Image: Steigerwald

What odd and interesting shapes can your students find in this geometric image?
Finding The Volume of Laptops

Finding The Volume of Laptops

How has the volume of laptops changed over time? You know you want to check out how huge those first versions were!
Exploring Circumference With Famous Circles

Exploring Circumference With Famous Circles

Let’s find how the diameter and circumference of famous circles are related.
Intersecting Angles and Streets

Intersecting Angles and Streets

There can never be just one angle.
An Olympic Sized Pool and Jet Fuel (Episode 3)

An Olympic Sized Pool and Jet Fuel (Episode 3)

How many times could you fill up a jet plane using the fuel that would fit in an olympic-sized pool?
What’s In My Brain: Pentagon vs Pentagon

What’s In My Brain: Pentagon vs Pentagon

We’re looking at regular vs irregular polygons.
Grouping Shapes by Parallel and Perpendicular Sides

Grouping Shapes by Parallel and Perpendicular Sides

Which shapes go together based on parallel and perpendicular lines?
Deducing the Area of Triangles

Deducing the Area of Triangles

Using patterns, students try to deduce where that area formula came from.
Geometry Image: Skytree

Geometry Image: Skytree

What odd and interesting shapes can your students find in this geometric image?
Fractals: Koch Snowflake

Fractals: Koch Snowflake

You could keep zooming in on this snowflake forever!
Geometry Image: Esplanade Theaters

Geometry Image: Esplanade Theaters

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