Tolong dibuat caranya ya…

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AB = 1/5 AC
BC = 28 m

maka BC = 5/5 – 1/5 = 4/5

BC = 28
4/5 x AC = 28
AC = 28 . 5/4 = 35 m

AB = 1/5 x AC
= 1/5 x 35
= 7 m