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p + l = 14 cm
p x l = 48 cm²
cari dua bilanagn dikalikan = 48
jika ditambahkan = 14
bilangan tersebut yaitu = 6 dan 8
panjang diagonal² = 6² + 8²
= 36 + 64
= 100
panjang diagonal = √100
= 10 cm