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80 = 2(6+l+l)
80 = 2(6+2l)
80 = 12 + 4l
80-12 = 4l
68 = 4l
68/4 = l
17 = l
Luas = p x l
Luas = (6+17) x17
Luas = 23 x 17
Luas = 391 cm