Students learn about the properties of triangles. They explore the various unique triangles that can be made on a square and isometric grid.

To begin the lesson students recap the names of common 2D shapes. In the development phase they are challenged to create siz unique triangles on a 3 by 3 grid. The end of the lesson challenges them to consider why some properties in triangles are impossible.

### Differentiated Learning Objectives

- All students should be able to identify an isosceles, equilateral, right-angle and scalene triangle.
- Most students should be able to know the properties of different types of triangles.
- Some students should be able to create all the unique triangles on a 4 by 4 grid.