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B = x -3
C = x
Perímetro = Suma de los lados
A +B +C = 81
x+9 + (x -3) +x = 81
x +9 +x -3 +x = 81
3x = 81 -9 +3
3x = 75
x = 75/3
x = 25
A = x +9 → 25 +9 = 34cm
B = x -3 → 25 -3 = 22cm
C = x = 25cm
Los lados miden:
A = 34cm
B = 22cm
C = 25cm