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Bab Bangun Datar
Matematika SMP Kelas VII

ED = DC = 13 cm
BC = EF = 12 cm

BD = √(DC² - BC²)
BD = √(13² - 12²)
BD = √(169 - 144)
BD = √25
BD = 5 cm
BD = DF = 5 cm

AB = √AC² - BC²)
AB = √(25,5² - 12²)
AB = √(650,25 - 144)
AB = √506,25
AB = 22,5 cm

AF = AB - BD - DF
AF = 22,5 -5 - 5
AF = 12,5 cm

jawabannya B

DB = FD = 13^2 - 12^2 = akar 25 = 5

AB = 25,5^2 - 12^2 = akar 506,25 = 22,5

AF = AB - 2DB = 22,5 - 2(5) = 12,5...

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