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Perímetro = 70 cm
lado 1 :25 cm
lado 2 :20 cm
lado 3 : x
70 = 25 + 20 + x
70 = 45 + x
70 - 45 = x
25 = x
El lado 3 = 25 cm
Es un triángulo isósceles. (Tiene dos lados iguales)