BC = x => AB = x + 4
2x + 2(x + 4) = 40
4x + 8 = 40
4x = 32
x = 8
AB = CD = 8 + 4 = 12
BC = DA = 8
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BC = x => AB = x + 4
2x + 2(x + 4) = 40
4x + 8 = 40
4x = 32
x = 8
AB = CD = 8 + 4 = 12
BC = DA = 8