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K = 48
L = 6
P = ?
k = p + p + l + l
48 = p + p + 6 + 6
48 = 2p + 12
48 - 12 = 2p
36 = 2p
36 ÷ 2 = p
18 = p
p = 18
jadi panjang persegi panjang tersebut adalah 18