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keliling = 2(2x-6)+2(x+8)
28 = 4x - 12 + 2x + 16
28 = 6x+4
6x = 28-4
6x = 24
x = 4
panjang(p) = 2x-6 → p = 2(4) - 6 = 8-6 = 2
lebar (l) = x+8 → l = 4+8 → l = 12
maka : Luas = p × l = 2 × 12 = 24