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Triangle
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☼ TRIANGLE : A triangle is a plane figure bounded by three straight lines ( called sides of a triangle ). A vertex of a triangle is a point where two straight lines meet. Thus, in a triangle there are three vertices. The symbol ABC is used to denote the triangle with vertices A, B and C. The three straight lines
,
and
are called the sides and the three angles
BCA,
ABC and
BCA are called the angles of the ABC.
