Triangles become pyramids. You're now a square based pyramid with 4 triangular faces and a square face for your bottom. You can get pyramids with different shaped bases. Triangles, pentagons ...

To expand students mathematical understanding of non-prototypical triangles as children frequently develop very restricted conceptions of geometric shapes. They often identify them solely based on ...

Enlargements create shapes that are similar. To understand congruence and similarity, a good understanding of the properties of polygons, including triangles and quadrilaterals, can be helpful.