Mathematics

Problem

\Delta ABC

D

lies on

AB

and

E

AC

with

DE \parallel BC

. Given

AD = 4\,\text{cm}

DB = 8\,\text{cm}

and

AC = 18\,\text{cm}

, find

AE

. a)

9\,\text{cm}

6\,\text{cm}

8\,\text{cm}

12\,\text{cm}