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Verified answer
Keliling 3 buah ∆ = 3×24cm = 72cm = keliling persegikeliling persegi = 4 × sisi
72cm = 4 × sisi
sisi = 18cm
sehingga luas persegi = sisi×sisi = 18 × 18 = 324cm² ✔️
semoga jelas dan membantu