public TinEdge GetPreviousEdgeInTriangle()

// nodes of the edge
var nodes = edge.Nodes;

// edge geometry
var polyline = edge.ToPolyline();
// edge length
var length = edge.Length;
// is the edge "inside"
var isInsideEdge = edge.IsInsideDataArea;
// edge type - regular/hard/soft
var edgeType = edge.EdgeType;

// get next (clockwise) edge in the triangle
var nextEdge = edge.GetNextEdgeInTriangle();
// get previous (anti-clockwise) edge in the triangle
var prevEdge = edge.GetPreviousEdgeInTriangle();

// get opposite edge
var oppEdge = edge.GeNeighbor();

// get left triangle
var leftTriangle = edge.LeftTriangle;
// get right triangle
var rightTriangle = edge.RightTriangle;