Orientation of polygon, convexity or concavity of vertices and point inclusion test are three fundamental problems in geometry. In this paper, a novel method to identify the orientation of a triangle using its extreme vertex order is proposed. The orientation of a polygon can be determined by a triangle which is composed of an extreme vertex and its two adjacent vertices. It determines the convexity-concavity of the vertex whether the orientation of polygon is same as the orientation of a triangle which is co…
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