tolng bantu ea no 4 a,b,c

A.
DE/AB = 12/18 = 2/3
AC/BC = 12/9 = 4/3
(maaf klo slah yg A)

B.
CD/AC = DE/AB
8/AC = 12/18
8/AC = 2/3
2AC = 8.3
2AC = 24
AC = 24/2
= 12cm

C.
BE/BC = DE/AB
6/BC = 12/18
6/BC = 2/3
2BC = 6.3
2BC = 18
BC = 18/2
=9cm

CE = BC - BE
= 9 - 6
= 3cm.