No comment. Sorry.

	private
	quadEdgeClass

	testing
	hasAllInsideCircle:

	accessing	top
	elevationHeight
	fanVertices
	fanVertices:
	leftFace
	leftFace:
	rightFace
	rightFace:

	private	top
	quadEdgeClass

	testing	top
	hasAllInsideCircle: Tests if all Points in aCollection are inside the circle which has this edge as a diameter