tolong dong kerjakan yg soal nomor 6...trima kasih

1) AB/BE = BC/BD
x+6/x = 12/8
8x + 48 = 12 x
48 = 12x - 8x
48 = 4 x
x = 48/4
x = 12.

AB = 12 + 6 = 18 cm

2) DE/AC = BD/BC
x/16 = 8/12
12 x = 128
x = 128/12
x = 10,6 cm.