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∠2 + ∠6 + ∠7 + ∠8 + ∠9 = 540° mengikuti jumlah sudut segi lima
jadi ∠1 + ∠3 + ∠4 + ∠5 + ∠2 + ∠6 + ∠7 + ∠8 + ∠9 = 360° + 540° = 900°
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