Four Dimensions of Space
If you notice: the layout has x and y coordinates in the flat plane and the Vertical plane. There is no " z." The Dimension " a " functions for " z." Or you only have to
do math in two Dimensions because all formula's are in terms of " a. " Choose " a " and the rest is settled.
1) Triangles 2
2) The First Construction before the Circle Graph Below
3) I Colored in the Circle Graph for Clarity