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hello , perimeter means length of total boundary . therefore for any triangle  u can add all the sides of triangle.

ex- in triangle ABC ,sides of triangle is given AB=2cm ,BC=3cm and CA=4cm

then, perimeter of triangle ABC =AB + BC + CA    

                                                  = 2cm + 3 cm +4 cm         

       perimeter of triangle ABC = 9cm

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Perimeter is the sum of the boundaries.so for finding perimeter we will add all the sides the ans obtained will the perimeter
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