This is a video resource that can be used in the classroom to help students understand defining and non-defining attributes of a shape. It corresponds to a packet that I have available as paid product, but can be used on its own.
Defining and Non-Defining Attributes of a Shape Packet
Note: The shape pieces that I use at the beginning of the video are not included in the packet.
I also have this video available on YouTube if that is easier for you.