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K = 88
2(p+l) = 88
2(l+4+l ) = 88
4l + 8 = 88
4l = 88-8
l = 80/4 = 20 cm
p = l+4 = 20+4 = 24 cm
Jadi L = p x l = 24 x 20 = 480 cm²