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= 2(3x - 4) + 2(x - 1)
= 6x - 8 + 2x - 2
= 8x - 10
b) K = 8x - 10
34 = 8x - 10
34 + 10 = 8x
44 = 8x
x = 44/8
x = 5,5 cm
L = p . l
= (3x - 4) . (x - 1)
= (3(5,5) - 4) . (5,5 - 1)
= 12,5 . 4,5
= 56,25 cm²