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AB + BC + CD = AD
(x - 1) + (x) + (x + 1) = 27
x -1 + x + x + 1 = 27
3x + (1 - 1) = 27
3x = 27
x = 27/3
x = 9
AB = x - 1 = 9 - 1 = 8
BC = x = 9
CD = x +1 = 9 + 1 = 10
Nos piden la menor longitud, por lo tanto es "AB"
AB = 8 ..... Rpta