EDGE is a line. ... 2D
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2D: head ~ ellipse.
3D: head ~ elliptoid.
Half head ~ hemieliptoid.
Ear ~ elliptoid.
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All Shapes ~ Continuous -> Equation
Simplify to ~ Deiscrete -> matrix
Piece each matrix together:
face = hemieliptoid + elliptoid
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To answer this question more details need to be provided. For example one a 3D shape one side is called a face.
A sphere
a line
You need at least one pair of parallel sides. Most trapezoids have that.
A cone has only one face and laid flat it would look like a piece/slice of cake