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          Triangle :- A triangle is a simple closed figure consisting of three line segments.  A closed plane figure bounded by three line segments is called a   triangle.         let A, B   and C   be three non-collinear points.         Then, the figure formed by the three line segments AB, BC and CA is called a triangle ABC,    denoted by  ∆ABC .       We denote a triangle by the symbol  ∆               In  ∆ABC    has Ø   Three vertices, namely A, B, C Ø   Three sides, namely AB, BC and CA Ø   Three angles namely ∠A,∠B, ∠C Ø   The sides   BC ,  CA   and AB are denoted by a, b and c         In  a triangle ABC, side AB and AC  meet at A.         the remaining side BC is the opposite side of vertex A,   also A is the vertex opposite side BC.         In  ∆ABC,the points A, B and C are called its vertices.         Clearly v   A is the vertex opposite to the side BC. v   B is the vertex opposite to the side CA, and