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K = 2(P+L)
80 = 2(P+(P-4))
80 = 4P - 8
4P = 88
P = 22
L = P - 4
L = 22 - 4 = 18
Luas = P x L = 22 x 18 = 396 m^2
p = x dan l = x-4 sehingga
K = 2p + 2l
80 = 2(x) + 2(x-4)
K = 2p + 2l
80 = 2(x) + 2(x-4)
80 = 2x + 2x - 8
80 = 4x - 8
80 + 8 = 4x - 8 +8
88 = 4x
88/4 = 4x/4
22 = x
L = p.l
L = x.(x-4)
L = 22.(22-4)
L = 22.18
L = 396cm²