write the definition of triangle and its shape
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A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted . In Euclidean geometry any three points, when non-collinear, determine a unique triangle and simultaneously, a unique plane (i.e. a two-dimensional Euclidean space).
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a closed plane figure bounded by three line segments is called a triangle.
shape - it has three straight sides and three vertices. The three angles of a triangle always add up to 180 degree.It is a polygon with at least possible number of sides .
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