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86 = 2 (15 + l + l)
86 = 2 (15 + 2 l) __ 2 x 15 + 2 x 2
86 = 30 + 4
86 - 30 = 4
56 = 4
56/4
lebar = 14
panjang = 15 + l
panjang = 15 + 14
panjang = 29
Luas = panjang x lebar
Luas = 29 x 14
Luas = 406 cm^2