Mein Hut, der hat 3 Ecken - Lied - Deutsch lernen

The video tutorial discusses the concept of corners using a hat as an example. It compares the properties of corners with jackets and reiterates the idea of a hat having corners. The tutorial introduces triangles and concludes with a summary of the discussed concepts.

What is the relationship between the hat and corners?

What type of shape is mentioned in relation to corners?