Shapes with flat, angled sides, like pyramids, work best to create 3D shadows. Once you've made your selections, take your flattened cardboard box and start tracing triangles (or the shape of your ...

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 ...

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 ...