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2(p+l) = 86
p + l = 43
eliminasikan
p + l = 43
p - l = 15 -
2l = 28
l = 14
cari panjang
p + l = 43
p + 14 = 43
p = 29
sehingga p = 29 cm, l = 14 cm
L = p x l
L = 29 X 14
L = 406 cm²
p = l+15
kll kebun = 2×(p+l)
86 = 2×(l+15+l)
43 = 2l + 15
2l = 28
l = 14
p = 29
L = p×l
L = 29×14
L = 406
ll