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Verified answer
DC = 8 cmEF = 9,8 cm
DE = 3 cm
AE = 7 cm
AD = 3 + 7 = 10 cm
misal x = EF - DC
........ x = 9,8 - 8 = 1,8
yang dicari AB = DC + y
DE/AD = x/y
3/10 = 1,8/y
3 × y = 1,8 × 10
3y = 18
y = 18/3
y = 6 cm
maka AB = DC + y
.......... AB = 8 + 6
...........AB = 14 cm (C)