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AD : LM = 8 : 6 = 4 : 3
jadi, AB : KL = 12 : x = 4 : 3
jadi, x = KL= 9 cm
Panjang KL = MN = 9cm
Lebar KN = LM = 6 cm
Keliling persegi panjang = 2 (p + l)
= 2 (9 + 6)
= 2 (15)
= 30 cm²