# Geometry

### Grouping Quadrilaterals In A Hierarchy

Can we classify quadrilaterals like we classify living things?

### Discovering Pi With Sticky Notes

Pi is mysterious and strange! Why not let students discover it on their own?

### Angles of a Triangle

Why tell a kid the rules of a triangle when they can discover them!?

### Deducing the Area of Triangles

Using patterns, students try to deduce where that area formula came from.

### 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.

### Regular or Irregular Polygons – Concept Attainment

Can your students puzzle out the differences in these shapes - without any instruction!?

### Letters With Symmetry

Let's group letters by their symmetry, then create symmetrical words, and then symmetrical sentences!

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

### Geometry Image: Victoria Conference Center

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

### Geometry Image: University Ave

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

### Geometry Image: Skytree

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

### Geometry Image: Steigerwald

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

### Grouping Shapes by Parallel and Perpendicular Sides

Which shapes go together based on parallel and perpendicular lines?