Hi

equilateral triangle

equal sides given in cm are (3a+2),(2b-a) and (b+3).

3a + 2 = 2b - a      |sides equal

    2a + 2 = 2b

     a  + 1 = b

3a + 2 = (a+1) + 3   |substituting for b for side (b+3)

    2a = 2

     a = 1  and b = 2    | that is each side is 5cm

Perimeter = 15cm 

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