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One side of small triangle + one side of large triangle = 30 cm

Perimeter → 30 + 30 + 30 + 15 + 15 = 120 cm

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A diagram to supplement my answer…

Perimeter → 30 + 15 + (s1 + s2) + (x2 + y2) + (x3 + y3) = 30 + 15 + 15 + 30 + 30 = 120cm

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