Tolongg ya butuh skrang, makasiii

8/12 = 10/AB
AB = 15cm
DB = AB – AD = 15 – 10 = 5cm

AB/AD = BC/DE
AB/10 = 12/8
AB = 12/8*10
AB = 15 cm

DB = AB – AD = 15 – 10 = 5cm