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kllng persegi = 4 x s
64 = 4s
s = 16cm
luas persegi = 16 x 16 = 256
luas persegi panjang = p x l
256 = p x 8
256 = 8p
p = 32cm
kllng persegi panjang
= 2(p +l) = 2(32 + 8) = 2(40) = 80cm