tolong jawab soal yang ada pada gambar ya kak

(3)
AB = 18, DE = 12, CD = 8, BE = 6

a)  AC = ...
AC/AB = CD/DE
AC/ 18 = 8/12
AC = (18 x 8)/12
AC = 12

b) AD = ..
AD = AC - CD
AD = 12 - 8 = 4

c) CE = ..
CE/CD = BE/AD
CE/8 = 6/4
CE = (8x6)/4
CE = 12
..