Can anyone help me with these question. Thank you.

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A better tomorrow

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