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Verified answer
Keliling persegi panjang= 2 x (p + l)
= 2 x (13 + 7)
= 2 x 20
= 40 cm
total kerangka
= 3 x 40 = 120 cm
keliling setiap persegi
= 120 : 5
= 24 cm
keliling persegi
= 4 x s = 24
s = 24 : 4
= 6 cm
semoga membantu:)