General Geometrical Terms

1. All About Geometry

2. Geometric Terms (Quia Games)

3. Geometry Flashcards

Polygons/ Shapes

1. Creating Polygons

2. Designer Fractions Activity

3. Jigsaw Puzzle Size-Up

4. Making Triangles

5. Memory Game

6. National Library of Virtual Manipulatives

7. Online Pattern Blocks 

8. Shape Tool

9. The Shape Game (K-1)

Angles

1. Estimating Angles

2. Introduction to Angles (Quia Games)

3. Pool Table

Area/ Perimeter

1. Area and Perimeter Game

2. Area of Rectangles and Squares

3. Perimeter of Polygon

Symmetry, Rotations, Reflections, Transformations

1. Bathroom Tiles

2. Symmetrizer

Pattern Blocks

1. Crack Hacker's Safe

2. Pattern Blocks

3. Pentominoes

Tangrams

1. Interactive Tangram Game

2. Tangrams

3. Tangram Game at PBS

4. Tangram Virtual Manipulatives

Tessellations 

1. Tessellation Virtual Manipulatives

2. Totally Tessellated (5th grade and up)

3. What are Tessellations?