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SegiEnam• ABCDEF
Pusat O
rusuk = 8 cm
Panjang BD
BD² = OB² + OD² - 2.OB.OD cos BOD
BD² = 8² + 8² - 2.8.8 cos 120°
BD² = 128 + 64
BD = √192
BD = 8√3 cm ✔