Vector Addition of Forces: Finding the Resultant Force

[Suy]

Homework Statement

[PLAIN]http://img138.imageshack.us/img138/918/79095797.png
Find AE resultant force

Homework Equations

The Attempt at a Solution

I don't know where to start, I can find some of angle, but still I don't get it,
Also this question is in my test, I remember the question said AB exerted force on AE resultant force something
thx

 

[JaredJames]

I'm assuming AD and AE are acting downwards (like a weight hanging).

So, firstly, resolve force AC into it's horizontal and vertical components.

You can show the component forces of AE and AD as well to make it easier.

Then, draw a free body diagram showing the direction each force is acting in.

From there, you should be able to resolve this system.

 

[Suy]

I tried to get all component for ABC, AB is already given 8N horizontal ,6.645 vertical
but still, it's doesn't help me to get AD
btw, this question is similar to this picture
http://session.masteringengineering.com/problemAsset/1162411/1/Probs.2-7_8.jpg
replace the black stick with blue part
also, I am in chapter 2.1-2.3, just click the link , you will see it
http://books.google.ca/books?id=JFuUEoT0iIUC&printsec=frontcover#v=onepage&q&f=false
I think I have to use parallelogram to do it?