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Bab Bangun Datar
Matematika SMP Kelas VII

trapesium
CF = √(BC² - BF²)
CF = √(13² - 12²)
CF = √(169 - 144)
CF = √25
CF = 5 cm

CD = 3 x CF
CD = 3 x 5
CD = 15 cm

BE = DF = CD - CF = 15 - 5 = 10 cm

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