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= Luas : Panjang
= 1350cm² : 45 cm
= 30 cm
Keliling Persegi Panjang
= (2 x Panjang) + (2 x Lebar)
= (2 x 45 cm) + (2 x 30 cm)
= 90 cm + 60 cm
= 150 cm
Jadi, kelilingnya adalah 150 cm