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properties of triangle.
Triangle properties:

Vertex :The vertex  is a corner of the triangle. Every triangle has three vertices.
Base         :The base of a triangle can be any one of the three sides, usually the one drawn                     at the bottom. 
         .
Altitude      :The altitude of a triangle is the perpendicular from the base to the opposite                       vertex. 
                The three altitudes intersect at a single point, called the orthocenter of the                           triangle.
          
          
Median :The median of a triangle is a line from a vertex to the midpoint of the 
                  opposite side. The three medians intersect at a single point, called the
                   centroid of the triangle. 

Perimeter:       The distance around the triangle. The sum of its sides. 
Interior angles : The three angles on the inside of the triangle at each vertex. 
Exterior angles The angle between a side of a triangle and the extension of an                                    adjacent side. 


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