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l = x + 1
Keliling = (2 x panjang) + (2 x lebar)
= 2(3x - 4) + 2(x +1)
= 6x - 8 + 2x +2
= 8x - 6 cm
= 2(3x-4) + 2(x+1)= 6x - 8 + 2x + 2= 8x - 6 cm
jadi kelilingnya= 8x - 6 cm