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It will be a few years before we get to celebrate the next Pythagorean Theorem Day in July of 2025. Here are some ideas for celebrating this fun mathematical holiday.

For many, the Pythagorean theorem (also known as Pythagoras’ theorem) is one of the most memorable formulas from high school math. Most adults would likely be able to rattle off a^{2} + b^{2} = c^{2} if prompted about the Pythagorean theorem even if they no longer know how to use the formula.

## What is Pythagorean Theorem Day?

To qualify as a Pythagorean Theorem Day, the digits that make up the date must qualify as a pythagorean triple. The next pythagorean triple date will be on July 24, 2025 since 7^{2} + 24^{2} = 25^{2}.

Previously, Pythagorean Theorem Day was celebrated on August 15, 2017 since 8^{2} + 15^{2} = 17^{2} and December 16, 2020 since 12^{2} + 16^{2} = 20^{2}.

Sometimes Pythagorean Theorem Day is known as Right Triangle Day.

## Ideas for Celebrating Pythagorean Theorem Day

## Pythagorean Theorem Notes

These are the pythagorean theorem notes I used with my trigonometry students in our beginning of year geometry review. We glued these notes in our trigonometry interactive notebooks.

## Make It Pythagorean Puzzles

Looking for a challenge? Check out this page of Make It Pythagorean Puzzles. Insert the same digit (in any manner of your choosing) to each side of the triangle to form a right triangle.

## Pythagorean Triple Posters

I created this set of free printable pythagorean triple posters to help decorate my new classroom.

## Pythagorean Triples Interactive Notebook Page

I decided my students needed a Pythagorean Triples reference page in their notebooks to go along with the posters I have hanging in my classroom.

## Romeo and Juliet Pythagorean Theorem Questions

To give my students a bit more practice with word problems, I typed up these Romeo and Juliet themed pythagorean theorem problems.

## Pythagorean Theorem Poster

I want to share a pythagorean theorem poster I created several years ago for my classroom when I was teaching trigonometry.