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Tenemos: lado mayor = a
lado menor = b
tercer lado = c
perímetro = p
a = 3b
a = c + 3
a + b + c = p = 25
3b + b + c = 25
4b + c = 25
a = 3b = c + 3
c = 3b - 3
4b + 3b - 3 = 25
7b - 3 = 25
7b = 28
b = 4
a = 3(4) = 12
c = 3(4) - 3 = 9
a = 12 cm
b = 4 cm
c = 9 cm