Bring some humor to your classroom with this collection of the best geometry jokes and puns. These jokes are sure to add a spark of fun to your geometry lesson and give your students a good laugh (or at least a groan at your cheesy math jokes.)

# Geometry Activities

Collection of Free Printable Activities and Resources for Teaching Geometry

Get the help you or your students need remembering all of the formulas needed for right triangle trigonometry problems with this handy right triangle trig formula sheet.

This two-page set of notes has students compare two methods of finding the distance between two points on the coordinate plane: the pythagorean theorem and the distance formula. It is designed for Pre-Calculus students who have seen both methods taught in previous courses. In my many years of teaching pre-calculus, I have found that students …

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 …

Looking for fun and engaging geometry puzzles? Here is a collection of 25 free printable geometric puzzles that I have used in the past with my high school math students. Most of these puzzles should be appropriate to use with individuals ranging in age from upper elementary school or middle school to adults. My students’ …

Last year, I started my pre-calculus class off with geometry review. The first topic we tackled was finding missing angles in triangles. This set of notes was the perfect opportunity to pull out some of my favorite school supplies: colored pens and highlighters! The purpose of these notes was to review three key geometry concepts …

I use these classifying triangles by angles and sides notes with my pre-calculus students as part of our first unit of the year which covers mainly geometry review. Especially with the pandemic, I have to spend quite a bit of time reviewing geometry before we can jump properly into trigonometry. I have my students fill …

Sankaku puzzles are a geometric based logic puzzle that focuses on finding the area of a triangle. The goal of each puzzle is to connect three dots to form a triangle with the specified area. Sankaku puzzles are the creation of Naoki Inaba, a prolific Japanese puzzle creator. I first discovered these puzzles several years …

This tricky triangles puzzle has been around for over a century – can you arrange these eight sticks to form exactly four triangles and two squares? The original puzzle was meant to be solved with matchsticks, but I don’t think I need to explain why I won’t be giving my students matchsticks to play with… …

It’s November which means it’s finally time to pull out this Triangular Turkey puzzle for Thanksgiving. How many different triangles can you find in this picture of a Thanksgiving turkey? I ran across this triangular turkey puzzle in a Martin Gardner book (Perplexing Puzzles and Tantalizing Teasers) this summer, and I knew I had to …

I’m excited to get back to featuring a new puzzle of the week every week in my classroom this year. A new puzzle I have prepped for this year is called Three of Five. Three of these five figures fit together to create a triangle. Which ones are they? I ran across this puzzle in …

I created these SOH CAH TOA notes for my Pre-Calculus students a few years ago to review how to find the trigonometric functions of an angle, given a triangle. First, we reviewed the different parts of a right triangle. I have also created a poster of the parts of a right triangle that might be …

Several years ago, I heard about the Let’s Make Squares activity from an OKMath Newsletter sent out by Christine Koerner. She recommended Let’s Make Squares as a great activity for the first week of school. I had already decided that I was going to do the 2s to 9s Challenge as my first day of …

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. I ran across these interesting puzzles in Golf on the Moon by Dick Hess (Dover Publications).

The Parts of a Whole Puzzle gives students five shapes that must be arranged to form a triangle whose three sides are of equal length. In other words, form an equilateral triangle. I would have renamed this as the Equilateral Triangle Puzzle, but I have already shared a different equilateral triangle puzzle on my blog …

I am really excited about this shape grid puzzle from Erich Friedman. The goal of the puzzle is to divide the grid into geometric shapes. Any lines you draw must follow either the grid lines or the diagonals of the grid squares. Each shape that you draw must contain exactly one shape icon inside. This …

I created these trig functions posters a few years ago when I was teaching a year-long trigonometry course. Somehow, they never got a blog post of their own. I created separate posters for the three basic trig functions and the three reciprocal trig functions. I designed these posters to print on 11 x 17 cardstock. …

I created this Parts of a Right Triangle poster several years ago when I was teaching trigonometry. I wanted to emphasize the vocabulary words for adjacent, opposite, and hypotenuse before we jumped into right triangle trig. I designed this parts of a right triangle poster to print on 11 x 17 cardstock. I hung this …

I want to share a pythagorean theorem poster I created several years ago for my classroom when I was teaching trigonometry. I designed this poster to print on 11 x 17 cardstock. I hung this poster on a bulletin board in my classroom with several other 11 x 17 posters I created. As I continue …

Today I’m sharing a new puzzle with you called the 8 sticks puzzle. Yesterday, I bemoaned the loss of my classroom puzzle corner. I’ve been trying to come up with some ways to keep incorporating puzzles in my classroom in a pandemic-friendly manner. My favorite puzzles are the ones with pieces that students can manipulate. …

The Square in Square Puzzle is a creation of the brilliant Peter Grabarchuk. It is one of my weekly magnetic puzzles that never made it up on the blog this school year. Imagine that… You are given sixteen rectangles. Among these rectangles, only two can be placed next to one another to form a perfect …

I really liked this angle matching task that I ran across in Mathematics for the College Boards by Rich Barnett (Copyright 1967 AMSCO). If you follow this link, you can “borrow” the book for free as part of the Internet Archive’s Online Free Library. There was a bit of confusion when I posted this question …

I think these count the quadrilaterals tasks from 100 Geometric Games by Pierre Berloquin could spark some great classroom conversation. I was able to view them on Amazon by choosing the “Look Inside” feature. How many quadrilaterals are in each diagram?

Master the art of the squaring off puzzle! Rotate and arrange given rectangular pieces to create a perfect square, testing your problem-solving skills. Thanksgiving Break is here, and I am oh so grateful for these few days off. This year has felt like one long learning curve as I figure out what life looks like …

In my last post, I shared the Square Pi Puzzle and mentioned that I was updating some older puzzles that have been long-time favorites of my students. Today, I want to share another updated puzzle, the 1-4-5 Square Challenge. I originally shared this puzzle on my blog in May 2015 which seems like an eternity …