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p = panjang
l = lebar
p + 1 = l + 3
p = l + 2 ...(1)
(p+3)(l+2) = 2. p l
(l+2+3)(l+2) = 2(l+2).l
(l+5)(l+2) = 2l(l+2)
l² + 7l + 10 = 2l² + 4l
2l² - l² + 4l - 7l - 10 = 0
l² - 3l - 10 = 0
(l - 5)(l+2) = 0
l =5 atau l = - 2 (tidak memenuhi )
L= 5 , P = L+2 = 7
Keliling = 2(P+L) = 2(12)= 24