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Let’s label the triangles A, B , C

Since the triangles are equilateral triangles , each triangle will have equal length for its 3 sides 

perimeter of A = a + a+ a

perimeter of B = b + b+ b 

perimeter of C = c + c + c

the total length would be the length of all triangles .

since it is given that a + b + c = 11cm

3 a + 3b + 3c =  11 x 3

                         = 33cm 

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