This activity can help children with angles. Instead of measuring angles on paper, this can illustrate angles into a read life demonstration. This is active learning because as children close the door the angle changes and they can now measure it.
Display many photos with an old frame, wire, and clothespins. PERFECT use for the huge frame I just took apart for the girls hair bow holder! (instead use coloring for clothespins and frame! Glitta it up)