Exploring Triangles

Topic:
Triangles

Exploring the features of triangles

Move the triangles about and create different shape triangles. What do you notice about each shape? What happens to the sum of all the internal angles? Flip the triangle over (by dragging on corner across to the other side of the triangle. What do you now notice about the external angles?

Exploring triangles

Watch this video... it will bring together what you have discovered about triangles...