Geometry & Measurement
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Algebra & Functions | Geometry & Measurement | Number & Operations | Statistics & Probability | Trigonometry | Calculus
3-D Figures
- Stellated Icosahedrons Made from Straw and Ribbon – Janelle Graham
- Icosahedron Ornament Balls Tutorial
- 3D Perspective Drawing – Shaun Carter
- Volumes of Pyramids Activity – Shaun Carter
- Volumes of Solids Geometry Project – Jennifer White
- Surface Area and Volume Project with Drawing Names on Isometric Graph Paper – Martin Joyce
- Illustrating Surface Area and Volume with Photographs – Patrick Honner
- Cylinder Dissection Activity – Amanda Coffill
Angles
- Angle Matching Task – Rich Barnett
- Angle Mazes – Naoki Inaba
- Missing Angles Task
- Complementary and Supplementary Angle Notes
- Hands-On Archaeology Geometry Activity
- Giant Printable Protractor – druinok
- Mini Protractor Pocket – druinok
- Missing Angle Notes
- Identifying Angle Types Slapjack Review Game – Tara Maynard
- Pinwheel Activity for Finding Central Angles – Coach Snyder
Area and Perimeter
- Area and Perimeter Posters
- Area Maze Puzzles – Naoki Inaba
- Perimeter of Polygons Foldable – Shaun Carter
- Areas of Polygons Cut and Paste Activity – Shaun Carter
- Area of Shapes Mini Poster Project – Shaun Carter
- Area of Triangle Puzzles (Sankaku) – Naoki Inaba
Circles
- Hands On Circumference Activity
- Areas of Circles and Sectors Activity – Shaun Carter
- Area of a Sector Lesson – Shaun Carter
- Area and Circumference of Circles Open Middle Task – Tim Brzezinski
- Circles Unit Classroom Decor Transformation – Taylor Harmon
- Circumference or Area? Activity – Kerri Sustich
Pi Day
- WORD SEARCH – Pi Day Word Search
- EDGE MATCHING PUZZLE – Pi Square Edge Matching Puzzle
- PENTOMINOES – Pentominoes Pi Symbol Puzzle
Constructions
- Snowflake Construction Project – Stephen Caviness
Coordinate Geometry
Distance Formula
- Finding Distance Between Two Points Practice Book
- Distance Formula Dry Erase Template – druinok
- Pythagorean Theorem and Distance Formula Notes
- Pythagorean Theorem, Distance Formula, and Midpoint Formula Mystery Activity – Sevdije Perezic
Midpoint Formula
Geometry Symbols
- Geometry Symbols Posters – Shaun Carter
Logic
- Laws of Logic Card Sort Activity – druinok
- Logical Thinking Puzzles – druinok
- If Then Poster Project
Measurement
- Measurement Puzzlers – A Survey of Mathematics with Applications
- Dimensional Analysis Shape Cards – Kathryn Freed
- Cut and Paste Dimensional Analysis Activity – Teacher Friendly Chemistry
- Animal Speed Chart Converting Units Activity
- Mini Metric Olympics Activity – AIMS
- Converting Units Foldable
- Converting Units Posters – Shaun Carter
Parallel Lines Cut by a Transversal
- Parallel Lines Cut by a Transversal Foldable – Kathryn at i is a number
- Hands on Angles Lesson – Sevdije Perezic
Points, Lines, & Planes
- Undefined Terms (Point, Line, Plane) Foldable – Shaun Carter
- All About Segments Foldable – druinok
- Find Someone Who: Points, Lines, and Planes – druinok (Note: file link no longer works, but there is still an image of the activity that you could use.)
Polygons
- Add Em Up Angles in Polygons Activity
- Perimeter of Polygons Foldable – Shaun Carter
- Areas of Polygons Cut and Paste Activity – Shaun Carter
- Polygon Art Project
Proofs
Quadrilaterals
- Count the Quadrilaterals Task – Pierre Berloquin
- Zukei Puzzles – Naoki Inaba
- Quadrilaterals Card Sort Activity – Shaun Carter
- Parallelogram and Rhombus Theorems – Shaun Carter
- Quadrilaterals Conjecture – Tracy Proffitt
Symmetry
- Rotational Symmetry Desmos Activity – Erick Lee
Transformations
- Rotations Around a Point Activity – Shaun Carter
- Transformations and Reflections Playlist – Ashley Spotted Wolf
- Teaching Transformations with Transparencies – Anna Scholl
- Blue Angels Transformations Activity – Virginia Department of Education
- Using Geometric Transformations to Solve Puzzles – Sarah Furman
- School Logo Scale Project – Joey Grabowski
Triangles
Area of a Triangle
- Sankaku Puzzles – Area of a Triangle Puzzles – Naoki Inaba
Classifying Triangles
Equilateral Triangles
- Parts of a Whole – An Equilateral Triangle Puzzle – The Ultimate Clever Puzzle Book
- Equilateral Triangle Puzzle – Richard Candy
Identifying Triangles
- Triangular Turkey Puzzle – Martin Gardner
- Triangles and Streamers Activity – Shaun Carter
Pythagorean Theorem
- Make It Pythagorean Puzzles – Golf on the Moon
- Pythagorean Theorem Poster
- Romeo and Juliet Pythagorean Theorem Questions
- Pythagorean Triples Interactive Notebook Page
- Pythagorean Triple Posters
- Wheel of Theodorus Bulletin Board
- Pythagorean Theorem Notes – Jessie Hester
- Proving Pythagorean Theorem Notebook Page – Shaun Carter
- Pythagorean Theorem Question Stack Activity – druinok
- Pythagorean Theorem and Distance Formula Notes
- Pythagorean Theorem, Distance Formula, and Midpoint Formula Mystery Activity – Sevdije Perezic
- ROUND-UP – Ideas for Celebrating Pythagorean Theorem Day
Right Triangle Trigonometry
- Parts of a Right Triangle Poster
- Clinometer Activity and Foldable
- Finding Missing Angles of Right Triangles Practice Book
- Parts of a Right Triangle Interactive Notebook Page
- SOH CAH TOA Poster
- SOH CAH TOA Foldable
- Right Triangle Trig Backwards Thinking Activity – Mr. Canning
- Right Triangle Trig Formula Sheet
Similar Triangles
- Shadows Task Involving Similar Triangles – OGAP Workshop
Special Right Triangles
- One Big Square Task – Open Curriculum Task Database
- Dragon Puzzle to Practice Special Right Triangles – Windows to Mathematics 10
- Special Right Triangle Discovery Activity
- Special Right Triangles Posters
- Special Right Triangles Practice Book
- Special Right Triangles Foldable – druinok
Sum of Angles in a Triangle
Triangle Congruence
Miscellaneous Triangle Resources
- Triangle Midsegment Activity – David Sladkey
- Isosceles Triangle Puzzle – Catriona Agg
Miscellaneous Geometry Resources
- Geometry Jokes
- ROUND-UP – Geometry Puzzles
- High Yield Geometry Routines – Weaver & Utley
- The Geometry of Tangrams
- Geometry Reference Sheet for Interactive Notebooks and Mini Protractor Pocket – druinok
- First Semester Geometry Reference Sheet – druinok
- Geometry Concentration Matching Activity
- Geometry Self-Checking Activities
- Geometry Sorting Activities
- Teaching Geometry Vocabulary with Origami – Lauren Rogerson