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keliling = 30 m = 300 cm
keliling = 2(p+l)
300 = 2(l+6 + l)
300/2 = 2l+6
150-6 = 2l
l = 144/2
l = 72 cm
p = l + 6
p = 72 + 6 = 78 cm
luas = p x l
luas = 72 x 78 = 5616 cm²